2/20/2017 new driver models for direct download:503
Benq 640u 5 stars review"The best driver WIKI ever! I wil keep coming back for sure."Eric Smalter, Boston, MA
Supported languages for Benq 640u
Certifications for Benq 640u
5 stars for Benq 640u "WOW! Finally my PC got up to speed!" Melany Kim 7/18/2015

Checking...for 2/20/2017 Updates

All drivers on are updated on daily basis.

However, a new version of Benq 640u might have been uploaded since our last site update.

Benq 640u Driver Download

Windows Compatibility for Benq 640u driver

Benq 640u Driver Details:

Benq 640u File Name:

Benq 640u Driver Version: 8775b39B

Benq 640u ZIP Size: 121.kb

Manufacturer: Benq

Benq 640u was fully scanned at: 2/17/2017
Scan Status: driver download scanOK

Benq 640u special revision for: Windows 7 Service Pack 1 (Microsoft Windows NT) 32 bit, Windows Vista Ultimate 64 bit, Windows XP Media Center Edition 2004 64 bit, Windows 7 Starter 32 bit, Windows 7 Ultimate 32 bit, Windows RT 32 bit, Windows 10 32 bit, Windows XP Tablet PC Edition 64 bit, Windows XP Media Center Edition 2005 64 bit

Benq 640u Download Stats:

Driver Uploaded: 1/6/2017

Direct Downloads: 370
Most Recent Download: 2/17/2017
Managed Downloads: 550
Most Recent Download: 2/19/2017
Download Mirrors: 5
Current Delay: 28 Seconds
Driver License: GNU

Direct Download Success Stats:

Reports Issued By 334/370 Users

Success Reported By 36/334 Users

Driver Download Score69/100

Driver Installation Score67/100

Overall preformance Score73/100

Benq 640u 6 Thumbs Up6Thumbs
Benq 640u 1 Thumbs Down1Thumbs
Benq 640u driver direct download was reported as adequate by a large percentage of our reporters, so it should be good to download and install.

Installation Manager Success Stats:

Reports Issued By 493/550 Users

Success Reported By 480/493 Users

Driver Download Score98/100

Driver Installation Score87/100

Overall preformance Score96/100

Benq 640u 441 Thumbs Up441Thumbs
Benq 640u 41 Thumbs Down41Thumbs
Benq 640u driver installation manager was reported as very satisfying by a large percentage of our reporters, so it is recommended to download and install.


1. Direct Download

Select your OS and press "Download".

This option requires basic OS understanding.
Select Your Operating System, download zipped files, and then proceed to
manually install them.
Recommended if Benq 640u is the only driver on your PC you wish to update.


2. Driver Installation Manager

This option requires no OS understanding.
Automatically scans your PC for the specific required version of Benq 640u + all other outdated drivers, and installs them all at once.

Please help us maintain a helpfull driver collection.
After downloading and installing Benq 640u, or the driver installation manager, take a few minutes to send us a report:
* Only registered users can upload a report.

Don’t have a password?
Please register, and get one.

Benq 640u may sometimes be at fault for other drivers ceasing to function

These are the driver scans of 2 of our recent wiki members*

*Scans were performed on computers suffering from Benq 640u disfunctions.

Scan performed on 2/20/2017, Computer: Panasonic CF-W8EWYAJP

Outdated or Corrupted drivers:6/19

Device/DriverStatusStatus DescriptionUpdated By Scanner
Microsoft Puente de ALI PCI a ISAUp To Date and Functioning
Mice And Touchpads
Logitech Logitech iFeel Mouse (USB)Up To Date and Functioning
Logitech Logitech USB Marble MouseCorrupted By Benq 640u
(Standard mouse types) HID-compliant mouseUp To Date and Functioning
Usb Devices
Sierra Wireless USB Mass Storage DeviceOutdated
Tandberg USB Composite DeviceUp To Date and Functioning
Sound Cards And Media Devices
Realtek High Definition Audio-apparaatCorrupted By Benq 640u
ASUSTek ASUSTeK Silicon BDA Video CaptureUp To Date and Functioning
Network Cards
Ralink 802.11n Wireless LAN CardUp To Date and Functioning
Microsoft Keyboard Device FilterOutdated
Hard Disk Controller
Intel(R) 82801DBM Ultra ATA-Speichercontroller - 24CAUp To Date and Functioning
O2Micro Standard-CardBus-ControllerUp To Date and Functioning
ENE ENE CB-1410/851 Cardbus ControllerUp To Date and Functioning
Cameras, Webcams And Scanners
Realtek Realtek USB2.0 PC CameraUp To Date and Functioning
Video Cards
Intel(R) 82945G Express Chipset Family (Microsoft Corporation - WDDM 1.0)Up To Date and Functioning
Input Devices
Microsoft USB Human Interface DeviceUp To Date and Functioning
Port Devices
Huawei HUAWEI Mobile Connect - USB Device (COM32)Corrupted By Benq 640u
Sony Digital Flat Panel (1024x768)Up To Date and Functioning
Mobile Phones And Portable Devices
Acer NOKIACorrupted By Benq 640u

Scan performed on 2/20/2017, Computer: Sony VGN-SZ55B_B

Outdated or Corrupted drivers:10/22

Device/DriverStatusStatus DescriptionUpdated By Scanner
Intel(R) HM77 Express-Chipsatz - LPC-Controller - 1E57Up To Date and Functioning
Mice And Touchpads
Elo TouchSystems USB Human Interface DeviceUp To Date and Functioning
Dell HID-compliant mouseCorrupted By Benq 640u
Genius HID mouseUp To Date and Functioning
Usb Devices
SafeNet SafeNet Inc. HASP KeyUp To Date and Functioning
Apple Apple Recovery (DFU) USB DriverUp To Date and Functioning C-Media USB Headphone Set (commercial 2.8.45)Corrupted By Benq 640u
Sound Cards And Media Devices
Analog Devices SoundMAX Integrated Digital AudioOutdated
DisplayLink Lenovo USB AudioUp To Date and Functioning
Network Cards
Atheros ORiNOCO 802.11n USBUp To Date and Functioning
Microsoft HID KeyboardCorrupted By Benq 640u
Hard Disk Controller
USB Compliance USB Mass Storage DeviceUp To Date and Functioning
Point Grey Research Texas Instruments OHCI-kompatibel IEEE 1394-vertskontrollerCorrupted By Benq 640u
Intel Intel(r) AIM External Flat Panel Driver 6Up To Date and Functioning
Texas Instruments Mass Storage ControllerUp To Date and Functioning
Intel(R) Sensor SolutionCorrupted By Benq 640u
Cameras, Webcams And Scanners
SunplusIT HD WebcamUp To Date and Functioning
Video Cards
Intel Standard VGA Graphics AdapterCorrupted By Benq 640u
Input Devices
Microsoft HID-compliant system control deviceCorrupted By Benq 640u
Port Devices
Prolific Prolific USB-to-Serial Bridge (COM6)Corrupted By Benq 640u
Sony Digital Flat Panel (1024x768)Corrupted By Benq 640u
Mobile Phones And Portable Devices
Acer NOKIAUp To Date and Functioning
Driver ModelOriginal Upload DateLast ModificationDriver FileFile SizeCompatible Computer ModelsAvailabilty To Instalation Manager
Benq 640u Q2.132.1871/7/201512/29/2016benq_640u-q2.132.187.exe30kbECS BAT-MINI, Fujitsu Stylistic LT P-600, Gateway S2.WNB03.004, Sony VGN-FW17_B, IBM 81712EU, Sony VPCF13S8R, Lenovo ThinkCentre M55, HP HP Compaq 2510p, Panasonic CF-30KBPAX2M, Toshiba SATELLITE C55-A-1FN, HP RX889AAR-ABA a6040, HP PS225AA-ABE, Sony VGN-FW140AE, Sony VGN-FW12G_W, HP KP266AA-ABZ, Toshiba Satego P100, MAXDATA PRO6105IW, Lenovo 3000 J115 Desktop, and more.
Benq 640u 1.19612/12/201412/28/2016benq_640u-1.196.exe98kbLenovo ThinkStation S30, IBM 18445GU, IBM ThinkPad X31, ECS PT880PRO-A, Panasonic CF-30CWQAZBM, HP PS347AA-B1U, Toshiba SATELLITE L850-13U, Packard Bell Imedia S3250, HP P7-1031, NEC PC-VW970BS, HP DY173A-ABH, Panasonic CF-19RHRAXPF, HP HP Compaq Presario CQ61, HP P6-2463eo, NEC EASYNOTE PB47Q01806, Sony VGN-A195EP, Packard Bell IXTREME I7709B, and more.
Benq 640u Z230061/24/201512/28/2016benq_640u-z23006.exe120kbPackard Bell IMEDIA 2450, Lenovo 209024U, HP HP Compaq dx6120 MT, Acer AM1620/VeritonM262, NEC PC-MJ30AAZ76, Seneca Pro86308, Sony VPCM126AA, Sony VPCZ23M9E, HP VD042AA-ABF p6105f, Gateway DX4710-UB801A, Sony VGN-TZ71B, and more.
Benq 640u 2.11.148410/7/201412/27/2016benq_640u-2.11.1484.exe63kbWearnes Premiere 8550Le, HP G5115ch-m, Fujitsu PRIMERGY TX100 S2, HP PS426AA-ABG m1299a, Sony VPCCW18FG, Lanix Lanix Corp, IBM 8141KGR, IBM IBM eServer 206m -[848510U, HP PS373AA-B14, NEC PC-LL750HG3E, and more.
Benq 640u 1.11.138212/19/201412/27/2016woouban-1.11.1382.exe199kbSony VGN-CR35T_B, IBM ThinkPad X41, EMachines EL1331-05, IBM ThinkCentre M51, IBM 8212MNA, Sony VGN-FE41ZR, NEC Express5800/120Eh [N8100-1287, Sony VOA, Seneca PRO102698, NEC PC-VY13MRFEAEHU, Seneca Pro64601, IBM 23736G4, Sony VGN-P45GK_W, HP HP ProBook 6455b, and more.
Benq 640u 402.1361/3/201512/27/2016benq_640u-402.136.exe193kbCompaq VS459AA-ABE CQ5211ES, Dell Studio 1457, Samsung SQ45/Q70C/P200, Intel IntelDQ965GF, IBM ThinkPad X40, EDsys EPROI5120W7P, Acer C-VX2611G, HP EC581AA-B1U, Gateway FX7026, Lenovo Lenovo H320 10046, Fujitsu FMVS90MB, HP HDX9300, HP Pavilion ze5600, NEC PC-LL550HG1F, EDsys EDSCADI73770, Fujitsu FMVLRA70, Haier T68 Series, Toshiba Satego P100, NEC PC-LL560MG3ER, and more.
Benq 640u 3280611/25/201412/28/2016benq_640u-32806.exe110kbLenovo 6075Y5X, LG P1-JPLCY, Dell OptiPlex GX1 500MTbr+, Lenovo ThinkCentre M57e, Lenovo 6463Y3W, Sony VGN-FE52B_H, Sony VGN-NW120D, HP KZ631AAR-ABA IQ505, Fujitsu FMVNA8HEC, Fujitsu FMVLRD50P, HP HP ENVY 17 3D Notebook PC, Fujitsu FMVTX95SD, Panasonic CF-S9LWGJDS, and more.
Benq 640u 422.17312/24/201412/29/2016xmsxkh-422.173.exe118kbLenovo ThinkCentre Edge 71z, Acer Aspire L3600, HP VS243AA-ABD HPE-010de, HP FK913AA-ABG s3660a, HP GX609AAR-ABA m9160f, Fujitsu FMVS565ABC, Compal DL7x, Toshiba SATELLITE C855-23Z, Compaq EL445AA-ABA SR1750NX NA651, HP GN551AA-ABA m8200, BYTSPD ByteSpeed LLC, Fujitsu LIFEBOOK S 7020, Sony VPCEB19GX, Gateway FX7026, Gateway PROFILE3, HP Presario R4000, Lenovo ThinkCentre A58, HP KA763AA-ABU, IBM 187263U, and more.
Benq 640u 71.12.1748/28/201412/27/2016benq_640u-71.12.174.exe40kbHP 168B, LG F1-2K39AB, Lenovo ThinkCentre M57p, HP FJ470AAR-ABA m9357c, Sony VGN-AW150Y, LG E500-G.ABBTZ, Sony VGC-RC70S, HP HP G5000, Lenovo 6458V35, Lenovo 20AL009CUS, IBM 1872W5A, Panasonic CF-W8GWEZFN2, and more.
Benq 640u O81.1701.11/8/201512/27/2016benq_640u-o81.1701.1.exe40kbCompal HGL30C, Sony VGN-FW56E, Gateway DX442S, MSI MS-7183, NEC PC-MY30AEZ5D6T6, HP Presario 2100, HP HP EliteBook 6930p, Lenovo ThinkCentre M55, Sony VGN-SZ38TP_C, Intel Intel G33 Series, and more.
Benq 640u 400849/13/201412/29/2016benq_640u-40084.exe213kbIBM 6221NPG, IBM 6218Z1H, Sony VGNFW463J/B, ALFATRON SpA DN1020/M, Epson ST160EEMR2, Sony SVE14123CBP, Sony VGN-NS20M_S, NCR 7457-3500-8801, Gigabyte MSH61PI-EX, JDL NOTE UL, LG Z1-B821P1, Lenovo ThinkStation D20, Sony VGN-NS31S_S, Toshiba Satellite P870, Supermicro P4SAA, SYX SYX-DP67BG-Extreme, Panasonic CF-29LWQCZBM, HP HP EliteBook 2730p, Compaq VT590AA-ABM CQ2404LA, and more.
Benq 640u 6202010/9/201412/28/2016qmq-62020.exe42kbHP DY173A-ABH, Panasonic CF-19RHRAXPF, HP HP Compaq Presario CQ61, HP P6-2463eo, NEC EASYNOTE PB47Q01806, Sony VGN-A195EP, Packard Bell IXTREME I7709B, Anhoch Goliath XD605, NEC PC-GL20ESYG5, HP NS886AA-ABG p6130a, VIA KM400/A-823x, Toshiba SATELLITE C855-1X3, HP VG244AA-ABU p6235uk, and more.
Benq 640u 4323312/11/201412/28/2016benq_640u-43233.exe152kbNEC EASYNOTE PB11400006, HCL Infosystems IGL 1701CT, HP PW706AA-ABM W5010LA, HP PW665AA-ACJ a815i, HP PN089AA-ABF m1180.f, Packard Bell ISTART 9112, Panasonic CF-R3DW1AXS, ECS PT880PRO-A, Compaq Presario 7110US 470016-083, Panasonic CF-SX1WEVHR, Sony VGN-P45GK_W, Sony VGN-FZ290FU, HP PW579AA-ABG m7088a, EMachines 3265IT, HP Compaq 615, Velocity Micro CINEMAGIX, WIPRO WSG48355W7-0023, NEC PC-MY26RAZ77S96, Sony SVE15129CGB, and more.
Benq 640u 2320911/18/201412/29/2016benq_640u-23209.exe105kbToshiba IS 1462B, Fujitsu CELSIUS W380, HP HP EliteBook 8530w, Seneca Pro354493, Packard Bell IMEDIA MC 9330, FIC ATM-Q45G, Toshiba NB100/HF, HP HP Compaq nc6320, Lenovo 20BC0000MH, Sony SVF1521R2EW, HP HP 2000-425NR, HP PAV NB DV9575EO GALAXY 1 0, NEC PC-VN770JS3EB, Lenovo 20AQCTO1WW, HP 100-6100BR, AT ALZA GAMEBOX, Fujitsu FPC03050DK, and more.
Benq 640u M1.122272/18/201512/29/2016benq_640u-m1.12227.exe216kbLenovo SS09302455, Sony VGN-FJ77SP_W, HP Pavilion dv5000, LG R560-U.ABLGL, MSI MS-9818, Fujitsu FMVLX70SDG, Sony VGN-SZ71E_B, AT TRILINE PROFI I102, Compaq EC537AA-ABZ SR1549IT IT530, Foxconn AT-7000 Series, Toshiba SATELLITE C870-14G, Sony VGN-CS62JB_R, Toshiba SATELLITE C855-2L1, Samsung 550P5C, LG R560-U.ARC3BT, IBM 2374F14, Sony VPCEB4E9R, Seneca Pro38611, and more.
Benq 640u E81.181.149/13/201412/29/2016ujsgnylyx-e81.181.14.exe96kbNEC Express5800/TM700, Gateway GM5485H, Gateway GT5226j, Lenovo ThinkCentre Edge 72, HP PN113AA-ABF t790.f, IBM 8212K4U, Compaq DD376A-ABX 6660. FI110, ASUS ESC4000 G2 Series, AnabelleB Soho WN10, LG LS50-AC6U1, and more.
Benq 640u 3222.1610/20/201412/30/2016benq_640u-3222.16.exe102kbMSI IR-7529, Dell BlackfordESB2, BenQ Joybook S32, Lenovo 7661ZRG, ASUS ET2400IGTS-H61, Panasonic CF-Y5LW8AXS, IBM 621910U, HP Presario V5000, Sony VGN-NS328J, MSI IR-7529, Samsung R710, and more.
Benq 640u 22431/14/201512/28/2016wul-2243.exe39kbHP GZ729AAR-ABA a6317c, Compaq GB376AA-ABE SR2237ES, HP Compaq 6200 Pro SFF PC, DIXONSXP Philips Freevents, ASUS A7V, Panasonic CF-30KTP48NL, IBM 2673CU6, HP BN744AA#ABG, HP KN472AA-ACB, HP Pavilion zv5000, and more.
Benq 640u 28611/19/201412/28/2016benq_640u-286.exe52kbLenovo 6463Y3W, HP 100-5010b, NEC PC-LL708WJ01B, IBM 8187SYU, Panasonic CF-S8HYEPDR, Compaq P2800N P170X520WC25EC, HP S5-1217, IBM 6221NPG, HP HP Compaq 2710p, Fujitsu FMVNFD85D, HP 3639, HP DF179A-ABZ a130, and more.
Benq 640u 200679/15/201412/29/2016ndsd-20067.exe214kbToshiba Qosmio D730, HP Hp pavilion ze4900, NEC PC-LS350ES1KR, Dimotion PCDO5V3, Sony VGN-FZ180U, Toshiba Dynabook Satellite L45 240E/HD, HP DT301A-ABM T450M, Lenovo 6463Y3W, Dell PowerEdge SC1420, IBM 2374WDG, AnabelleB Soho WN10, IBM System x3650 M4 -[7915F2M, Compaq Presario 7110US 470016-083, Packard Bell EasyNote LM83, Sony VGN-SZ32GP_B, HP HP EliteBook 8440p, SAMSUN 305U1A/305U1A, IBM 842777G, and more.
Benq 640u 2384612/31/201412/30/2016benq_640u-23846.exe64kbHP EG211AA-ABG m7288a, Fujitsu D2812-A1, NEC PC-VY22XRXEAAFM, HP Presario 2200, NEC PC-VJ25AAN6HJR9, Lenovo 6457WTU, DIXONSXP Philips Freevents, Lenovo ThinkPad SL510, Fujitsu FMVA52ALPJ, Packard Bell NC-ENLE11BZ-4508G1TMNKS, IBM 8172KMG, and more.
Benq 640u 6241.171/25/201512/28/2016benq_640u-6241.17.exe185kbSony VGN-TZ71B, Lenovo 23061G2, WIPRO WIV37455-0252, Sony VGN-TZ27FN, HP WX217AV-ABA MS230z, Sony PCG-U101, NEC PC-VJ22ERNTHGLB, Toshiba Dynabook SS LX/190DR, Lenovo SS09221149, Sony VGN-CS62JB_R, Compaq NQ905AA-ABU CQ5012UK, HP BK175AA-ABA HPE-270f, Sony VGN-FE18GP, Intel Crestline, HP HP Compaq nc6230, Sony VPCEA47EC, HP AW010AAR-ABA p6210t, and more.
Benq 640u 80721.110/31/201412/29/2016benq_640u-80721.1.exe163kbSony VGN-BZ13XN, HP NP189AA-ABA s5160f, Sony VGN-NS225J, SAMSUN Q308, HP GP G62-A20SY NB, HP G5144fr-m, Samsung G910, Toshiba SATELLITE C50D-A-10Z, Sony SVE151100C, Packard Bell IMedia D3235, Grupo@Sitre NOMADA_s1300, HP HP dx2000 MT, Lenovo 6075Y5X, and more.
Benq 640u 21.12.13812/24/201412/28/2016benq_640u-21.12.138.exe78kbToshiba SATELITE, Lenovo 3000 J110 Desktop, HP FL308AA-ABD IQ512de, Compaq PX734AA-ABA a123l NA520, Sony VPCF13QFX, HP PY142AA-AB3 w5180d, Viglen Dossier XR, Sony VGN-Z21WN_B, HP PS294AA-ABZ, Intel Test Product, HP HP Pavilion zd7000A, and more.
Benq 640u S40491.110/21/201412/29/2016benq_640u-s40491.1.exe163kbSony VPCEL15EN, Fujitsu ESPRIMO E900 0-Watt, QUANMAX ChiliGREEN X7, ZEPTO Znote 6515WD, IBM 621936U, HP HP Envy 13 Notebook PC, Panasonic CF-19LCRDX6B, LG R560-U.ARC2BT, Dell Inspiron M4040, HP HP Compaq 2510p, Acer TravelMate 8371, NEC PC-MY26XHZE1, Sony VPCF115FG, Sony VPCF13D4E, Toshiba Dynabook T351/46CWD, Sony VGNBZ579N03, and more.
Benq 640u 7222810/22/201412/28/2016ubkueeb-72228.exe105kbHP HP Pavilion dv1000, Pinnacle C5108, IBM ThinkPad R52, NEC PC-VY26AEZ78, Advent DT1404, Gateway GT5094j, Lanix Lanix Corp, Acer TravelMate 8531, HP PL499AA-UUZ, Acer NC-E1-531-B9604G, Sony VGN-NS130AE, Sony PCG-Z505SX, Gateway MX3050b, HP GU631AA-UUW, LG E300-A.CB20A, and more.
Benq 640u 1.107082/6/201512/29/2016benq_640u-1.10708.exe100kbHP P6540d, HP P6680pt, Toshiba Dynabook T554/45KR, Sony SVE1412ECXP, Compaq FJ403AA-AB9 SR5502PT, MIKROLOG Power P45-CO, HP Pavilion ze5400, Toshiba SATELLITE L850-A892, ARLT Computer Produkte Mr. Whisper X R3, Compaq ER922AA-ABA SR1834NX NA661, Packard Bell EasyNote LS85, Panasonic CF-53SAWZYMG, HP PX635AA-ABU, IBM 841742U, HP KJ401AA-aba A6437C, HP P6580t, Fujitsu CELSIUS W380, and more.
Benq 640u 6026212/3/201412/27/2016benq_640u-60262.exe66kbPanasonic CF-Y4HW8AXR, HP CQ2803EDm, Acer Predator G5900, HP HP d530 CMT, HP HP Pavilion tx1000 Notebook PC, Acer Aspire L3600, LG LM70-PKJE, IBM 6229LQG, HP ES133AA-UUZ, Toshiba SATELLITE C55-A-1CR, Lenovo 2008WHV, HP ES116AA-B14, Compaq Presario 6266EA, Toshiba Dynabook EX1/524CDE, HP HP ProBook 4710s, LG S1-MDGLG, Acer Extensa 2900E, and more.
Benq 640u X321.11.11.110/28/201412/28/2016benq_640u-x321.11.11.1.exe181kbPanasonic CF-30CCQCZBM, Compaq PE427A-ABU S7150UK GB420, Lenovo ThinkCentre M55p, Lenovo ThinkPad X121e, LG F1-2K39AB, Toshiba Dynabook REGZA PC D731/T7DRS, LG X200-L.AGFLZ, HP GS292AA-ABG a6150a, HP M7640n-ABA m7640, Lenovo 8927W1L, Acer Aspire L3600, Omni OTC-H3222D00, HP BN496AV-ABA HPE-170t, ASUS U6Vc, and more.

Please Note: There are particular operating systems known to have problems with Benq 640u:
  • Windows 10
  • Windows 7 Starter
  • Windows Fundamentals for Legacy PCs
  • Windows XP Media Center Edition 2003
  • Windows XP Media Center Edition 2004
  • Windows 8 Enterprise
  • Windows 7 Home Basic
  • Windows XP Home Edition, for home desktops and laptops
If you encounter problems with the direct download for these operating systems, please consult the driver download manager for the specific Benq 640u model.
Laptop Benq 640uTablet Benq 640uDownload Benq 640uUpgrade Benq 640uUpdate Benq 640u2017 Benq 640uFree Benq 640uData Benq 640uInfo Benq 640uHelp Benq 640uGuide Benq 640uComments Benq 640uWindows 10 Benq 640uVista Benq 640uWindows 7 Benq 640uInstall Benq 640u