Originally Posted by Descent95
I'm having trouble getting my board to 4GHz stable with a Phenom II 965. I have a GA-990FXA UD3 Revision 3. I've gotten this chip stable on my old board (Biostar TA970XE), and it passed Prime95 for 16 hours straight.
This board cannot be reliable at these speeds regardless of settings. I had the same issues with a GA-970A-UD3 Rev 3, these problems are even more pronounced now.
The clock speed jumps around like crazy and I can't find a way to remedy it. Raising the NB Core seems to help, as well as the Northbridge voltage. But it doesn't eliminate the problems entirely. My VRM's do not appear to be throttling. Changing other clock related settings doesn't seem to help, unless I underclock the NB HT and CPU HT. C1E and PowerNow are disabled.
Sometimes it takes 10 minutes, sometimes it takes 3 hours, but regardless Core 4 fails Prime. This was also the weak link on my Biostar.
Any ideas on what settings I can change? I've been messing with this thing like crazy. If I can get the clocks peed to stay constant around 4010, I'll be set. Sometimes it will jump as high as 4081!
I've uploaded a video demonstrating the problem (The huge clock rate jump is at the end), pictures of my settings, and a CPU-Z text file.
Unstable Clock.txt 96k .txt file
From the pictures I can only think of these things:
1. You used a combo OC or FSB OC, make sure you have a calculator with you when doing this.
Your CPU-NB is at 2200 or X11 in UD3 rev 3 speak while your FSB is at 243. You cant pull off a CPU-NB more than 2600 stable. Not even with an FX chip (Although some can, but that depends on their chips).
2. Clocks jumping around like crazy as you described it, it can only because the FSB jumps off from it's value. Even at stock FSB of 200, it will go up to 201.XX which, if you multiply with your CPU multiplier, will yield jumps depending on how much the multiplier is set to. In your case, 243, give or take ~1.5 MHz, will yield you + ~20MHz..
3. Another one, your HT Link must not be lower than your CPU-NB. This is the case for FX Chips, but I guess same is to your Phenom. So match those numbers.
My advice is that you lower that FSB, or even try doing just a stock of 200. CPU multi at 20, CPU-NB at 2200, HT Link at stock. Add some offsets of your CPU Core Voltage, Give your CPU PLL something like 2.695. NB/PCIE PLL of 1.895. Try.
In short Try running a Multi OC first. mind about the FSB later once you see your chip capable of your target OC by using just the Multipliers.Edited by mus1mus - 10/20/13 at 9:17pm