Two different Timing/voltage RAM in the same system

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SingeDebile

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I have been running two pairs of different memory together for maybe 6 months, they are both 1gig Corsair XMS2 DDR2 800mhz except one pair has a voltage and timing of 5-5-5-18 1.80v and the other of 4-4-4-12 2.10v .

Despite the differences these four sticks worked happily together for the past 6 months, except yesterday either nvidia's motherboard update or window's 7 update decided to break this ignorant marriage.

Now the only way my system will boot up happily is with just one set installed, I have tried both combinations for having all 4 gigs in the system, with one the system gives out a long beeeeep and hangs, with the other the system hangs on the boot memory test.

and the mother board is a
Evga 750 SLi FTW

I was digging around the bios, and couldnt really see a way of setting the memory timings/voltages differently per ram slot.


...so My question is this, is there any way to get this to work? If I roll back and use the evga motherboard drivers (and not the nvidia ones) to get it to work (assuming thats what did it) am I hurting the system?

any help would be appreciated thanks!
 
Solution
Welcome to Tom's Forum! :)

Well you at least get why we don't recommend mix-matching RAM ;)

Here's a mix to try:

DDR2-800 5-5-5-18 1.80v
DDR2-800 4-4-4-12 2.10v
==================
DDR2-800 5-5-5-18 1.95v ~ 2.10v

1. Boot with only the working RAM

2. BIOS:

MEM (DDR), MHz -> 800
Memory Timing Setting /
Memory Timing Setting -> Expert
tCL (CAS Latency) -> 5
tRDC -> 5
tRP -> 5
tRAS -> 18
Command Per Clock (CDM) -> 2T
System Voltages /
Memory -> 1.95v ~ 2.10v ; trial by post/boot failure, you can start high and work down to 1.95v

Save & Exit = Yes

3. Shut down

4. Install all RAM

5. Boot and keep fingers crossed

Let me know.
Welcome to Tom's Forum! :)

Well you at least get why we don't recommend mix-matching RAM ;)

Here's a mix to try:

DDR2-800 5-5-5-18 1.80v
DDR2-800 4-4-4-12 2.10v
==================
DDR2-800 5-5-5-18 1.95v ~ 2.10v

1. Boot with only the working RAM

2. BIOS:

MEM (DDR), MHz -> 800
Memory Timing Setting /
Memory Timing Setting -> Expert
tCL (CAS Latency) -> 5
tRDC -> 5
tRP -> 5
tRAS -> 18
Command Per Clock (CDM) -> 2T
System Voltages /
Memory -> 1.95v ~ 2.10v ; trial by post/boot failure, you can start high and work down to 1.95v

Save & Exit = Yes

3. Shut down

4. Install all RAM

5. Boot and keep fingers crossed

Let me know.
 
Solution

SingeDebile

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Jan 12, 2012
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and thank you once more!

I was able to get it down to 1.95 stable (writing here).. and the timing has been set manually to what you said.

(next time I will not be mixing ram)

 
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