Overclocking problem with P965 NEO

Question

Hi, i actually have a problem with cpu and memory.
my settings are:
MSI P965 NEO
2x 1Gb Gskill DDR2 800Mhz 4-4-3-5 2.0v
Core2duo e6300
zalman 9500CPN
i  want to overclock the micro, and set the ram to the proper timigns, if i set all to auto, and the FSB to 300Mhz, the ddr speed raises to 473Mhz, and it's not what i like, i just want to reach a 1:1 FSB ratio and increase only cpu FSB not RAM fsb.
Here i dont have the FSB:DRAM ratio, like i used to have in my asus.
Ok, going to the point, i want to know how to increase cpu fsb and not the ram mhz. and also put the ram to the full spec.
the ram is at AUTO and the speed manually to 667 because the problems i found with CPU-Z.
The SPD reports 400Mhz, 4-4-3-5-24(trc)-2T
Thanks,
Ariel

Answer 1

Quote from: pszemia on 23-May-07, 01:22:26
i want to overclock the cpu without overclocking the ram, is that possible with this motherboard??
for example: 333Mhz cpu and stay at 800Mhz for ram
the cpuz is reading actually 379 (i cant remember the exact value, but is around this) for ram when i have set to manual 667 why this happen??? (the cpu is at 300)
The memory speeds you can select are not absolute but FSB:RAM dividers
533Mhz equals the 1:1 divider
667Mhz equals the 4:5 divider
800Mhz equals the 2:3 divider
This means if you select 667Mhz RAM in bios you don't force 667Mhz but you select a FSB:RAM ratio of 4:5
At stock FSB of 266Mhz this makes : 266 / 4 = 66.5 * 5 = 333 Mhz (666 Mhz DDR) wich is the 667Mhz you select.
However, if you change FSB the RAM speed changes along with it.
So, for your 300Mhz this makes :  300 / 4 = 75 * 5 = 375 Mhz  wich is +- the 379 Mhz cpuZ reads.
If you want 333Mhz fsb and ram @ 800 select 667Mhz RAM in bios and set FSB to 333Mhz, also enter RAM timings manually.
This will result in 333 / 4 = 83.25 * 5 = 416 Mhz (832 Mhz DDR) for ram - The gskill should be able to take this mild 32Mhz overclock.
The board might not make it to 333Mhz tho - It's a budget board wich overclocks poorly.