Solved Speed of PC2-6400 Memory mix w/ diff. timings

September 19, 2011 at 12:05:22
Specs: Windows Vista x64 Ultimate, AMD Phenom II X4 920
I mixed two different PC2-6400 Memory Modules in my computer. I have 4x 2GB Memory Modules for a total of 8GB Memory. All the modules are from OCZ. Two of them are OCZ DDR2 PC2-6400 Vista Upgrade and the other two are OCZ DDR2 PC2-6400 Gold GX XTC. All 4 are 1.8 volts. The thing is that they have different timings. The website claims that they are both 800Mhz, but according to CPU-Z the vista upgrade SPD highest Frequency under JEDEC is 400 Mhz at 5-6-6-18-24 and the Gold GX XTC SPD highest Frequency under JEDEC is 333 Mhz at 5-5-5-15-20 (under SPD in CPU-Z the Max Bandwidth for the Gold GX XTC modules is PC2-5300 333Mhz), but under the Memory tab in CPU-Z under Timings is says: DRAM Frequency is 401.8, FSB:DRAM 1:2, and the rest of the timings are 5-6-6-18-25 and CR is 2T, so my question is if all the ram is runnng at the same speed? (Yes I know the 400 Mhz is muliplied by 2 for DDR2) Some other information that might help you answer my question is my Motherboard is the GA-MA770-UD3 and in bios the memory muliplier is set to x4. One other question I have is that in the bios it states that for 2 of the modules the TRFC is 195ns and for the other 2 the TRFC is 127.5ns, so I manually set the other 2 to 195ns, so all the memory modules are running at 195ns., should they all be set to 195ns or 127.5ns?

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September 19, 2011 at 13:16:58
✔ Best Answer
Yes all RAM sticks are running at the same frequency.
Get AIDA64 open it motherboard > SPD now u can check the timings for all modules.

FSB : DRAM ratio exist when CPU use FSB.

We can not fight new wars with old weapons, let he who desires peace prepare for war - PROPHET.

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September 19, 2011 at 14:31:03
RAM always runs at the same timing. You shouldnt mix RAM of different timings especially ECC memory

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September 24, 2011 at 12:26:34
Yea I thought it was because the DRAM Frequency is 401.8. Think my motherboard automatically changed the timings for all of it to run at the same frequency.

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