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Quick question about RAM speeds.

post #1 of 6
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I have a board that supports up to PC3200 RAM (DDR2).

If I put in new PC6400RAM, it will run at PC3200 speeds, right?

+rep to answers.
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post #2 of 6
Yes
post #3 of 6
It will try to change the FSB:RAM divider so that it runs as close as it can to PC-6400 speeds. If that doesn't work you can make it run at PC-6400 speeds by changing it yourself.

Are you 200% sure your board is DDR2? I don't ever think I've seen DDR2 PC-3200.
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post #4 of 6
yes it will work, but the mobo will force it to run at pc3200 speeds.

just like ddr2 1066 wont run at full speed on a mobo that only supports ddr2 800.
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post #5 of 6
Quote:
Originally Posted by mnishimura00 View Post
yes it will work, but the mobo will force it to run at pc3200 speeds.

just like ddr2 1066 wont run at full speed on a mobo that only supports ddr2 800.
Actually your wrong.

The motherboard supports any speed of RAM, but it can only be achieved if the highest RAM multiplier times the FSB equals the RAM's rated speed. So if your CPU is running stock and it's stock FSB is 266Mhz, and your board only has a 4x RAM multiplier, then your highest achievable RAM speed is 1066Mhz. But if your FSB is over clocked like mine is to 400Mhz, and your board has a 4x multiplier, then it can hit a RAM speed up to 1600Mhz, even though my motherboard is rated for DDR2-1066.

So the real final answer is:

It depends on your CPU's FSB and your motherboards highest RAM multiplier.
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post #6 of 6
Quote:
Originally Posted by mrtn400 View Post
Actually your wrong.

The motherboard supports any speed of RAM, but it can only be achieved if the highest RAM multiplier times the FSB equals the RAM's rated speed. So if your CPU is running stock and it's stock FSB is 266Mhz, and your board only has a 4x RAM multiplier, then your highest achievable RAM speed is 1066Mhz. But if your FSB is over clocked like mine is to 400Mhz, and your board has a 4x multiplier, then it can hit a RAM speed up to 1600Mhz, even though my motherboard is rated for DDR2-1066.

So the real final answer is:

It depends on your CPU's FSB and your motherboards highest RAM multiplier.
I don't understand how changing the RAM:FSB multiplier would allow for faster than PC3200 speeds--isn't the PC3200 speed limit dictated by the RAM:FSB multiplier--basically at the highest multi (lowest divider) with the FSB at stock, the RAM is at PC3200 speeds, and the only way to increase it would be to raise the FSB?

Anyhoo, the RAM *can* be run at faster than PC3200 speeds, but likely that will take a drastic increase in FSB to get it to PC6400.
    
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