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RAM speed and FSB speed

Not really.

Since you are talking FSB, i assume we are talking Intel (since AMD doesn't have a FSB).


Pentium D/Pentium 4 FSB = 200 MHz quad pumped (200 x 4).
That's how they call it 800 MHz FSB (even though it's just 200 quad pumped).

For C2Ds, that's 266.66 MHz quad pumped (266.66 x 4)
That's how they call it 1066 MHz FSB (even though it's just 266 quad pumped).

As for RAM, DDR/DDR2, you have DDR (double data rate) speeds.

So normal 1:1 speed for P-D/P4 would be 200 MHz double data rate aka DDR400/DDR2-400.

And of course, for C2D, that's 266 Mhz aka DDR2-533.


However, Intel's architechture has loved bandwidth for a long time now, so running RAM at faster speed than the FSB (like say 4:5 or 2:3) will always result in better performance than 1:1, assuming timings are the same.

Generally speaking, even with timings looser, on C2D anyway, higher speeds are better than lower speeds (even with the tighter timings).

I made a little thread here talking about the same thing...
http://forums.anandtech.com/messageview.aspx?catid=28&threadid=1971132


 
So, going with the Intel D975XBX2 mobo (default RAM voltage 1.9V), the Intel Core Duo E6700 processor, and a 2GB kit of Crucial Ballestix DDR2 PC2-6400 memroy at CAS 4 (default voltage at 2.2V, timings at 4-4-4-12) - what happens if I leave everything at the defaults versus adjusting the mobo voltage to 2.2V and setting the timings at 4-4-4-12? Is there any differences in stability or performance?
 
When you buy any RAM other than cheap stuff, you should be setting the frequencies/timings/vdimm in the bios manually.

Otherwise, it's more than likely to just run @ SPD settings, which will be something like 533 5-5-5.
And you don't buy 800 4-4-4 RAM to run @ cheapo RAM settings.

If you aren't OCing, you'd set the RAM to 2:3 or DDR2-800, with timings at what they are rated.

If OCing, then you'll want to run 1:1 till you find the CPU's max.
 
Originally posted by: n7
When you buy any RAM other than cheap stuff, you should be setting the frequencies/timings/vdimm in the bios manually.

Otherwise, it's more than likely to just run @ SPD settings, which will be something like 533 5-5-5.
And you don't buy 800 4-4-4 RAM to run @ cheapo RAM settings.

If you aren't OCing, you'd set the RAM to 2:3 or DDR2-800, with timings at what they are rated.

If OCing, then you'll want to run 1:1 till you find the CPU's max.
Click to expand...

I more question - if the mobo default is 1.8V, but the RAM is 2.2V, should I adjust the mobo voltage to 2.2V?

 
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