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64-bit PCI

D

Daovonnaex

Golden Member
I've been looking hard for socket-A boards that have 64-bit PCI slots and overclocking features, can anyone recommend one on the KT266A chipset (turns out that the nForce has no support for PCI-X)?
 
Keep in mind that the 64-bit slots on the 760MPx chipsets are 66Mhz and run at 3.3volt. They are -not- backwards compatible with 64-bit 33Mhz cards and you can -not- put a 32-bit PCI card in the slot. They are keyed differently and most 64-bit cards out now (Adaptec 29160, Tekram 3xxx) will not work. There are very few 64-bit, 66Mhz cards available that have the correct voltage and are keyed properly - mainly fibre channel cards.
 
OK, the slots are 3.3V-only ... however they do take 33-MHz cards. Keep in mind that doing this kicks the entire bus back to 33 MHz ... and the 760MPX chipset also connects the south bridge and secondary PCI to this primary PCI bus - so you cut total system PCI bandwidth in half by putting a slow card into one of the fast slots. Bad move, so to say.

LSI btw does have adequate SCSI cards available, most of them being dual-channel U160 or U320. Gigabit ethernet cards and good RAID cards usually are 66 MHz capable too.

regards, Peter
 
Some of the 64-bit cards out there are 66Mhz capable but most are not 3.3V and physically won't fit anyway. The Tekram U160 card is a good example. It will run 64-bit 66Mhz but only at 5volts which the slots on the MPx boards do not support. Many other cards have the same restriction.
 
The Tekram card is using the -33 flavor of the LSI 53C1010 dual channel U160 chip, so there's little sense in keying it 3.3V. Why they didn't key it universal escapes me - the chip can do either.

LSI uses the 53C1010-66 on their 64-bitty cards, and the -33 on the 32-bit 21003.

regards, Peter
 


<< Keep in mind that the 64-bit slots on the 760MPx chipsets are 66Mhz and run at 3.3volt. They are -not- backwards compatible with 64-bit 33Mhz cards and you can -not- put a 32-bit PCI card in the slot. They are keyed differently and most 64-bit cards out now (Adaptec 29160, Tekram 3xxx) will not work. There are very few 64-bit, 66Mhz cards available that have the correct voltage and are keyed properly - mainly fibre channel cards. >>

Adaptec sells 64-bit 66mhz PCI cards (the one I'm buying is the 3210s), and not all of the PCI slots on the board are 64-bit--only two of them are 64-bit 66MHz, the others are 32-bit 33MHz slots.
 
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