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Can I mix PC2700 with PC3500 DDR?

B

bupkus

Diamond Member
Currently using 2x256MB OCZ PC3500 EL at Cas 2.0 with an Epox 8RDA+ (nforce2) with a 2500+ Barton overclocked with a fsb of 200.

Can I populate the third dimm slot with a stick of 512MB Corsair Extreme XMS PC2700? This Corsair memory is listed as CMX512-2700C2 which I suppose means it's cas 2.0 as is the OCZ I have. If I can't run the Corsair fsb at 200MHz and Cas 2.0 should I try to run it with a more relaxed setting? Would I be any better off running the three modules as fast as the Corsair can at Cas 2.0 or should I just drop the Cas 2.0 for something high that perhaps the Corsair can reach?
 
You are running a 200 overclock;so no. If you ran 166Mhz bus it would be ok. It is not worth the performance hit.
 
Try to run them all at CL2.5 or even CL3 DDR400. The XMS should allow for some overclocking, hopefully up to that speed.
 
The Corsair PC2700 will allow for some overclocking..just don't know how much. A good thing to reach for is 185 at CAS 2.
 
Originally posted by: Excelsior
The Corsair PC2700 will allow for some overclocking..just don't know how much. A good thing to reach for is 185 at CAS 2.
Click to expand...

Assuming I could reach 185 at CAS 2, would a fsb difference of -15 and a drop from 2200MHz to 2035Mhz be a noticeable performance hit?
Or, if I did manage to reach 200 but with either CAS 2.5 OR 3.0, would that be a noticeable performance hit?

I'm trying to get an idea which metric is more significant, CAS or fsb/cpu, assuming that can be a trade-off.
 
The raw speed is much more important than CAS latency--timings on most platforms don't mean much. Get to 200 with as low latency as you can, maybe even a little beyond.
 
Since dual memory controllers need similar if not identical memory modules I'm thinking that which of my 3 modules go into which 3 dimm slots doesn't matter as dual controllers will probably be disabled with all 3. No? Yes?
 
I don't think you'll be able to run DC, but you won't be missing out on anything--it only makes a difference on an AXP if using onboard video.
 
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