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Evga 680i + 8500cd [4gb]


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I've just recently built up a new computer and being a Quadcore user I had to RMA the motherboard immediately - quickly received the update A1 revision (didn't even get time to try overclock the old board!).


Now the new A1 board is having difficulties. With 5-5-5-15 2T 2.2v I get these results..

- Can't post @ 1066 using 4gb

- Maximum post @ 920mhz w/4gb (unstable/BSOD)

- CAN post @ 1065 only with memory banks 1+2+3 or any combination of the

3. Once RAM is inserted into slot 4 (eg. 1+4, 2+4, 3+4, 1+3+4, 1+2+3+4 - BSOD's and MemTest86+ failures.

- Tested EACH stick individually in different slots and ALL post @ 1065 and report no memtest86+ errors for about an hour.


Soo, I thought I'd settle for booting at 800mhz. (4-4-4-12 1T 2.2v) I

turned the multiplier down to 8x with the hope of setting the FSB (QDR)

to 1600mhz, giving me the 3.2ghz o/c, but I've now discovered that I

cannot boot into XP(32) with a FSB above 1440mhz!


So it sounds like it's the motherboard being unstable right? Well, EVGA will not RMA the board, instead they want me to ship my mobo+4gb ram to Germany to test it. Im not keen on shipping £533 (postal service insurance will only cover upto £150! max.) and be left without a computer for about a week - this is my workstation rig!


EVGA are blaming the RAM for causing the BSOD's and lockups.

What tests can I perform to check the stability of the ram?

Are these the correct timings?;

5-5-5-15 2T 2.2v @ 1066

4-4-4-12 2T 2.2v @ 800


If I'm being forced to run at 600-700mhz, is this ram capable of CAS 3? If so what are stable timings? is 1T an option or will this also produce BSOD/lockups?


Today I've also had it BSOD at 1260fsb/610mem! (4-4-4-12 2T)

I'm consistently getting the same BSOD error:



Maybe all 4 ram modules are faulty..?


Basically any help or advice would be gratefully appreciated!

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It would be close to impossible that all 4 modules are bad, did you test the modules one at a time at there tested setting? And with 4 modules you may need to run the memory at 800 MHz that is normal.
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Yeh, I tested each stick individually in different slots and ALL post @ 1065 and report no memtest86+ errors (ran the tests for about an hour then stopped)


Ahh so 4 modules would cripple it to 800mhz? Hrm I only went with the single processor route because I thought I'd have better RAM speeds.. maybe I should have just got a 2x cpu server/workstation with expensive RAM :)


So, CAS 3 or 1T isnt a stable option for the 8500cd?


I got desperate and cancelled all my work - the motherboard is in transit back to EVGA, I'll report back when I get more information about the problems they've found

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  • 1 month later...

one month later and i've got the replacement nf680i board :D


4gb @ 5-5-5-15 2T 2.2v

9x multiplier

1420 FSB (QDR) / 355mhz BUS

947 MEM Linked (3:2)


no lockups, no BSOD's.. so stable!

definitely worth the wait.

so it seems some boards will do it, and others might have a dodgy memory controller!

thanks for the advice

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Is the 8500cd the same memory as the QUAD2X4096-8500C5DF? I only ask because I have the EVGA nForce 680i SLI 775 A1 MoBo (122-CK-NF68-A1) and want to buy the QUAD2X4096-8500C5DF, but I have no idea if they are compatable. the EVGA site dose not have the QUAD2X4096-8500C5DF in thier list of memory for this board, but I thought it just might need to be updated. Nor did i find any benchmarks here for the same combo, figured it hasn't been tested yet. Please help. Are they compatablity? And what can I expect to run it at if so? Thank you.


EDIT:Just seen that Trev is using Corsair TWIN2X2048-8500C5D so I know it is not the same memory I am looking to buy.

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