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Does having 4x 1GB in Nforce4 slow down to 333Mhz vs 400Mhz?

T

Techno

Golden Member
Hello,

I was doing some research on some nForce4 motherboards and some of them say that when all 4 banks are used, the memory is clocked at 333Mhz wile other motherboards don't even say it. I'm stuck between a MSI K8N Neo Platinum SLi or a EPoX EP-9NPA+ SLi. Do either of these boards run the memory at 400Mhz w/ 4 x 1GB?

Thanks!
 
I believe it's a CPU issue more so than a motherboard one. If you have a Venice (or Manchester/Toledo/Venus/Denmark) core A64/Opteron, then you should be able to run 4 sticks of RAM at 400MHz - however command rate will usually be limited to 2T instead of 1T. Older processors had the 333MHz limit with 4 RAM sticks.
 
The RAM controller is in the CPU. But it is not an "issue" at all, neither of CPU nor chipset - it's the physical reality that increasing load (more chips) degrades signal quality on a common bus. This is why DDR400 is limited to one DIMM per channel, DDR333 is for two. Most desktop systems have enough margin that DDR400 with relaxed timings is worth a try anyway - but don't _expect_ to get there.
 
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