Barend said:
Hi
Stupid questtion maybe, but...
How do I setup PC4000 memory sticks (Corsair, 2x512mb) in my P4C800E-De
Luxe BIOS?
I know I can fiddle the memory settings, but how do I raise the 200 MHz
(x2) memory frequency maximum?
Thanks
Barend
The memory clock is determined by the DDR setting in the BIOS and the
degree to which you are overclocking the CPU. This is because the memory
clock is derived from the CPU clock, so when you overclock the CPU,
you automatically overclock the memory at the same time.
Example:
CPU clock = 250 (nominal is 200 for a FSB800 processor)
Memory DDR set to DDR400
Actual memory clock = (250/200)*DDR400 = DDR500 (PC4000 fully used)
CPU clock = 250 (nominal is 200 for a FSB800 processor)
Memory DDR set to DDR333 (actually DDR320 in hardware - see manual)
Actual memory clock = (250/200)*DDR320 = DDR400 (PC3200 fully used
and PC4000 is kinda wasted).
So, to get the mileage from PC4000 memory, you need a lesser
processor, that you plan on overclocking. If you buy a 3.2C processor,
there isn't enough room to use a CPU clock of 250MHz, because a
reasonable overclocking limit on air is about 3.8Ghz. If you are
lucky, a 3.0C boosted by using a CPU clock of 250MHz, will hit
3.8Ghz, and at the same time allow some PC4000 memory to be run at
its limits.
You can have virtually as much fun with PC3200 memory and the "DDR333"
setting as you can with the PC4000 memory and the "DDR400" setting.
The difference is an improvement in memory bandwidth, which might help
any benchmarks you are running.
To see how overclockable processors are, see:
http://www.cpudatabase.com/CPUdb/
HTH,
Paul
