2gb ddr2 400mhz and 2gb ddr2 800mhz whether work together

Sale Mandic · Feb 24, 2014

Hi, in my PC 2x1GB ddr2 (CPU-Z is shown DRAM Frequency as 400Mhz) RAM is pre installed, I need to install another 2gb ddr2 800mhz ram in another slot and whether these will work together or will create some problems.
Is it important order of old and new memory?

Please advise..

Pinhedd · Feb 24, 2014

Sale Mandic :

Both of those sets are most likely DDR2-800. CPUz shows the DRAM IO bus clock, which is half of the per-pin transfer rate, so DDR2-800 has a bus clock of 400Mhz. There are no DDR2-1600 modules (that would have an 800Mhz bus clock) that I am aware of.

FX6350 · Feb 24, 2014

If you install a lower clock ram module, and one hgher clocked, the one that's higher clocked, will underclock to match.
So yes, it will work.

EasyLover · Feb 24, 2014

Dear, your current RAM is 800 MHz. When adding RAM later on, pl ensure that both RAMs have same timings/speed otherwise compatibility issue can be faced. Order is not important but creating channel is important. Use slots 1,3 or 2,4 to create channel.

Sale Mandic · Feb 25, 2014

Thanks guys for your quick responses..
But I don't understand „creating channel“.. CPU-Z is shown that I have single channel and I use 2 ch.(2x1GB). Should I create or do something before I put stick on motherboard?
Until now I didn't do anything. I'll get stick tomorrow.
Thanks again for your advice..

EasyLover · Feb 25, 2014

Sale Mandic :

Dear, on CPU-Z there is a TAB with title Memory. Click on it. Find the value against DRAM Frequency and report it here.

Sale Mandic · Feb 25, 2014

DRAM Frequency is 400 Mhz.

EasyLover · Feb 25, 2014

Sale Mandic :

Dear your RAM is 800 MHz DDR2. So putting another RAM with 800 MHz DDR2 (Should be same timings) can work together.

gashonie · Feb 14, 2016

for best preformances single channel ,first two slots if AMD mobo, 1 and 3 -2 and 4 for Intel, 2x 1 or 2 gb DDR2 ram with same freq. If you add for dual channel same sizes and same freq. Othervise will work assingle channel - 64 bit. Dual channel 128bit, tripple 196.

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2gb ddr2 400mhz and 2gb ddr2 800mhz whether work together

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