Originally posted by: asicman
Update: Loaded the newest 7/28 BIOS from EPoX and that makes things even worse. 240x10 with DDR166 is my stable setup with the 6/28 BIOS, but with 7/28 windows BSOD when I start Prime95 with the same settings.
Don't know if it is the 1t/2t thing, but I don't care.... Reverted back to 6/28
Something you need to aware of is the NF4 BIOS DDR SETTING.
When you set it at ~
200Mhz it is running at 1:1
166Mhz it is running at 6:5
133Mhz it is running at 3:2
Your MEMORY has factory spec of 200mhz (DDR 400)
Now... If you plan to OC your CPU to 250 FSB.
You should set your DDR rating at 166mhz.
250*5 / 6 = 208Mhz (this will be how fast your RAM actually running)
HT Frequency for Ultra Board is actually limited to 1000mhz.
So if you are running your cpu at 250Mhz FSB, you should set it to 4X 250*4 = 1000
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My Venice 3000+ for example..... (BFG Tech Nforce4 Ultra mobo)
I am running my CPU @ 289 FSB
Then I have to set my DDR rating at 133mhz
289*2 / 3 = 193Mhz (This is how fast my RAM will be running)
HT Frenquecy for me will be 3X 289*3= 867 (well below the spec)
However, I can increase to 4X 289*4= 1156 (which I have to increase chip voltage)
*Your ram might have fast cas rating, however, it is sometimes unavoid to set it slower to 3-4-3-8 with Ram voltage set to 2.7V*