minsc_tdp
10-06-2006, 06:41 PM
I've been running 2GB G.Skill F1-4000USU2-2GBHZ series on my DFI UT NF4 Ultra-D at 275 MHz, 1:1 (no divider), at 2.8V for a while with no problems. LDT/HTT multi was 3 (so, 1650 HTT, well within the 2000 limit for Socket 939/Clawhammer Athlon 64 4000+), CPU multi was 9.5 for 2612 MHz. Due to some problems with previous memory, I set all the DRAM settings to AUTO and that seemed to work well with the G.Skill also, so I left it.
That was under the 6/23 bios. I just upgraded to the latest BIOS and carefully restored all of my previous settings by hand. But, no boot - it would POST and just before saving the BIOS backup, it would reboot. I tried increasing the LDT voltage a little, and lowering the LDT multiplier to 2, no go.
If I drop it to 250 MHz FSB with an LDT/HTT multiplier of 3, it works great, even with a higher CPU multiplier (10.5, so CPU is 2625 MHz). So, something about this new BIOS forced me to lower my FSB.
I recall someone mentioning that 275 MHz FSB on this board was tricky due to something with the HTT/LDT, but even lowered, no good. They said they were stable at higher clocks, so I closed my eyes and pushed it to 300 MHz with the same result - POST ok, but reboot before memtest could even kick in.
I tried loosening my timings from 3-4-4-8 to 4-4-4-12 and it REALLY didn't like that... no POST, had to hard clear the CMOS and drop it back to 250.
I have a feeling my DRAM settings aren't ideal for OCing this RAM, would like to know what the best settings are for these HZ chips. I can provide more detail on the chips if necessary.
I think the chipset is OK since it's got a nice copper cooler, but it still runs a bit hot even at 250 MHz, so it could be something there, but it *feels* like the RAM.
Detailed CMOS settings are in this spreadsheet:
http://knepfler.com/oc.xls
Any help would be appreciated. Thanks G.Skill guys!
UPDATE: It seems stable at 260 MHz, running tests, and I just noticed the top sticky addressing my exact question (SORRY SORRY!) so I'll be trying that once I confirm 260 is stable. It's still curious though, that I got 275 with the old bios, and with the new bios I'm at 250-260...
http://knepfler.com/images/minsc_pc.gif
That was under the 6/23 bios. I just upgraded to the latest BIOS and carefully restored all of my previous settings by hand. But, no boot - it would POST and just before saving the BIOS backup, it would reboot. I tried increasing the LDT voltage a little, and lowering the LDT multiplier to 2, no go.
If I drop it to 250 MHz FSB with an LDT/HTT multiplier of 3, it works great, even with a higher CPU multiplier (10.5, so CPU is 2625 MHz). So, something about this new BIOS forced me to lower my FSB.
I recall someone mentioning that 275 MHz FSB on this board was tricky due to something with the HTT/LDT, but even lowered, no good. They said they were stable at higher clocks, so I closed my eyes and pushed it to 300 MHz with the same result - POST ok, but reboot before memtest could even kick in.
I tried loosening my timings from 3-4-4-8 to 4-4-4-12 and it REALLY didn't like that... no POST, had to hard clear the CMOS and drop it back to 250.
I have a feeling my DRAM settings aren't ideal for OCing this RAM, would like to know what the best settings are for these HZ chips. I can provide more detail on the chips if necessary.
I think the chipset is OK since it's got a nice copper cooler, but it still runs a bit hot even at 250 MHz, so it could be something there, but it *feels* like the RAM.
Detailed CMOS settings are in this spreadsheet:
http://knepfler.com/oc.xls
Any help would be appreciated. Thanks G.Skill guys!
UPDATE: It seems stable at 260 MHz, running tests, and I just noticed the top sticky addressing my exact question (SORRY SORRY!) so I'll be trying that once I confirm 260 is stable. It's still curious though, that I got 275 with the old bios, and with the new bios I'm at 250-260...
http://knepfler.com/images/minsc_pc.gif