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Watch out for UDMA66 cables

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  • Watch out for UDMA66 cables

    I Don't have a UDMA66 Mainboard but i tested one of those new UDMA66 cables because I thought that the OS does a check on how clean signal it gets and setts the speed acordingly.
    And i did get faster transfers.

    But at the same time my RRG started to drop frames like it was payed to do it.
    And i got all the artifakts that has been reported at the forum: black&white picture, green stripes, inverted colors etc etc.

    When i replased the cable with the old one everything went back to normal.

    An UDMA66 cable has an higher ohm than a standard.(thiner cables)
    And mayby UDMA66 controlers and drives rise the ampere to "BOOST" the signal?

    ------------------
    INTEL PIII550 MSI 6163
    G400Mill 32MB SGRAM + RRG
    SBlive
    128 MB RAM CAS2
    19GB HDD Space! (6.4+13 quantum drives)
    Pioneer 104S DVD 10x CD 40x SLOT IN
    SONY CRX100E 4/2/24 CDRW

    If there's artificial intelligence, there's bound to be some artificial stupidity.

    Jeremy Clarkson "806 brake horsepower..and that on that limp wrist faerie liquid the Americans call petrol, if you run it on the more explosive jungle juice we have in Europe you'd be getting 850 brake horsepower..."

  • #2
    It could be. A higher resistance cable generally is used to raise the peak signal voltage. Maybe even to the point of RFI.

    But the odd thing is that the 80 conductor cables were supposed to eliminate this: they are grounded on every other wire (Ground, Signal, Ground...etc., etc.) This was supposed to have reduced EM crosstalk.

    I've experienced none of this, but I have a Marvel, not an internal RRG.

    Could it be a bad cable?

    ------------------
    My (Current) Primary system:

    Abit BE6 (PL BIOS)
    P3 450
    384MB PC-100 SDRAM (Non-ECC)
    Matrox Marvel G200-TV AGP (NTSC) v2.6 BIOS
    3Com 905B-TX NIC
    SBlive (W/ OD I/O Card, Liveware 3.0 + Update)
    ADS Cadet Radio Data AM/FM Card (8 Bit ISA)
    3x WD AC28400 EIDE HDDs (ATA66 Enabled)
    Creative DVD5241E EIDE 5x DVD-ROM
    M/S Windows 98SE (English)
    DirectX 7

    My (Current) Secondary system

    Data General/ ALR 2650 Mobo (v6.004 BIOS)
    2x P2 266 (SMP)
    128 MB PC-100 SDRAM (ECC)
    3 x Number9 Revolution 3D 8 MB PCI Adapters
    Adaptec 6901 10BT NIC
    Onboard Adaptec 2940 U2W
    Onboard Intel 82558 NIC
    Onboard Cirrus Logic SVGA adapter (Disabled)
    Creative ModemBlaster 5601 Data/Voice/Fax Modem (ISA)
    Creative AWE64 Gold
    2x WD 4.5 GB Enterprise SCSI3 HDD
    Panasonic LK-MW602 CD-R
    Nakamichi MBR 7.4
    2 EIDE HDD Swap bays
    Windows 98SE/NT Server Dual boot
    DirectX 7/SP-6

    Tertiary system:
    Dell Inspiron 7100 Laptop


    Hey, Donny! We got us a German who wants to die for his country... Oblige him. - Lt. Aldo Raine

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