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Can TWIN2X2048-8500C5D run at 4-4-4-12-2T to match my TWIN2X2048-6400C4D?


Homeskillet

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I'm running on a Asus P5K Deluxe / Wi-Fi with a Core 2 at 2.67. I have a set of TWIN2X2048-6400C4D running at DDR2-800, 4-4-4-12-2-T timing. I found a some TWIN2X2048-8500C5D that is priced cheaper than the 6400C4D I have currently (mail in rebates are great). However, I'm really worried I won't be able to keep my low CAS timing since the 8500C5D is rated for 5-5-5-15-2T at a higher clock speed.

Would running the 8500C5D ram at DDR-2 800 allow it to hit the 4-4-4-12-2T timing? Or would it only do so if I get lucky? I figured I paid the extra $75 back in the day for the lower CAS timing... so its a feature I'd like to keep...

Thanks!!!!!!

 

From reading other articles, it sounds like, "yes I can" but would be nice to have some people with experience tell me first hand.

Thanks!

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From reading other articles, it sounds like, "yes I can" but would be nice to have some people with experience tell me first hand.

Thanks!

 

It depends. The only memory Corsair supports in a four DRAM slot population is their Quad kits. This does not mean they will not work, just that you have no recourse to RMA Corsair if they do not work. If there are problems with the DRAM modules, they are still supported via lifetime warranty, but that is for physical defects ie. errors in a two stick kit mode. Be sure that you get the same version DRAM. Be careful here, because there can be the same model but different versions that will NOT play nice together. Different models such as you have might well be incompatible. They might not as well but there can be many issues that can arise when you mix and attempt to match different models and versions. Matched Quad sets are highly binned modules for a four slot population. The Dual sets are tested as a kit, not a Quad.

 

Please research this thread:

 

http://www.houseofhelp.com/v3/showthread.php?t=64360&highlight=Unpredictable+results+QUAD2X4096+Gigabyte+X38-DS5

 

There is a limitation of the On Motherboard (Intel) memory controller and a population of all four banks at the full speed of a two bank run. This limitation is across the board with both AMD and Intel chipset based boards, DDR, DDR2 and DDR3.

 

Keep in mind that often issues can arise in the longer term even though you have shorter term stability. The issues seldom damage the DRAM unless you raise the DRAM voltage too high. They damage the on CPU (AMD) memory controller which has a harder time keeping up with the demands of a four DRAM slot population being run as fast as a two DRAM slot population. Those who want to be secure in their system either purchase a single kit of the DRAM capacity that the four singles have or they move to a higher bandwidth DRAM and drop the bandwidth. I also advise it as I have personally seen the issues that can and often do arise with a four DRAM slot population running at the full speed of a single kit speed.

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