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Do I need 800Mhz ram modules for 1333fsb in my e8200?

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March 12, 2008 7:26:39 AM

I heard that only if a 800Mhz ddr2 ram stick was plugged in will the 1333mhz standard FSB work for the C2D processors. Is this true??

My mobo supports 1333Mhz fsb.

Please reply urgently.

Thanks in advance :) 
March 12, 2008 8:54:02 AM

i think that's stupid..Put whatever u want, u have a FSB/Memory ratio so u can use DDR2 667 if u want. The proc will still work at FSB 1333
March 12, 2008 9:03:43 AM

Of course it will, what most other people say, is that it's wiser that the RAM and the FSB have the same frequency for optimum performance. Core2Duo's will run on low frequency RAM, but depending on the actual frequency, the performance might be severely affected....... At least on benchmarks.....
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March 12, 2008 9:33:00 AM

thanks a lot guys... not sure from where i picked that incorrect info up from...
March 12, 2008 12:11:20 PM

It was mentioned on other posts, but the MB clock is actualy 1/4 of the CPU's FSB and the DDR2 clock is 2*MB clock (if set to 1:1 ratio). So on your 1333MHz advertised MB, the board's base clock is actually 333 MHz and if you set the FSB to RAM ratio to 1:1, the RAM would run at 666MHz.

This would also mean that with DDR2-800, you could potentially reach a FSB of 1600MHz (and many people do with Q6600 and E8400 CPUs).
March 12, 2008 12:25:57 PM

shafrox said:
I heard that only if a 800Mhz ddr2 ram stick was plugged in will the 1333mhz standard FSB work for the C2D processors. Is this true??

My mobo supports 1333Mhz fsb.

Please reply urgently.

Thanks in advance :) 




it should work just fine! now if you want to run at 1:1 with the mem just only raise the cpu clock from 333 in bios to 400 and that will put your FSB to 1600 from 1333. that will match ddr2 800 (remember "dual channel" mem so it's really ddr2 1600)

if you don't wan to OC then as Paul_gren said get ddr2 667 mem as that matches 1333FSB making cpu to mem 1:1 ratio as well.
March 12, 2008 12:59:09 PM

Indeed .. (gosh I love this word, meh :p )

Agree with Zenthar and paul green, and the others too. Seems everyone got same point.

I'm using DDR2-800 (PC2-6400) with an FSB1333 processor (and FSB1333 mobo). And I have no problem at all. I'm suggesting to use 5:6 ratio (BUS : DRAM) for a DDR2-800 on a FSB 1333 processor. This ratio is natively support by current intel chipset (P35 & X38 & X48). Setting at 1:1 ratio is also fine, but for some reason it's slightly decreasing the whole performance. Well it's really a slight difference so you won't be notice in a real life anyway.
March 12, 2008 1:44:53 PM

Really all you need is DDR2-667 for a 333MHz (1333MHz effective) FSB. If you set up a 1:1 ratio as has been suggested a few times already, DDR2-667 RAM will operate at its native speed. You will probably be able to get some pretty tight timings at that frequency as well.

Of course, there's no harm in moving up to DDR2-800, and with prices the way they are right now I would recommend doing that anyway. With DDR2-800 you could use a 5:6 ratio as antas suggested or stick with 1:1 and have some really tight timings. Also, if your motherboard is up to the task you would be ready to run a FSB1600 processor (if such things were ever made affordable...).
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