Hello UD3 rev 3 owners,
I'm just sharing my experience OC'ing my Piledriver on our "beloved motherboard revision"
I don't know where to start this so please bear with me. My cheap system was composed of the following:
Gigabyte 990FXA-UD3 rev. 3
AMD FX 8320
8 Gigs of Kingston HyperX Genesis 1866 C9
Palit GTX 650Ti Boost OC version
Windows 7 Professional 64
I am currently clocked at 4667 with 267 Blck. X9 CPU-NB and HT or 1800 on the bios. Voltages were both + 0.075 for Core and CPU-NB. Feeding them with RAM OC'd to 2133 @ 9-11-9-27-1t @1.75V. Unstable with Prime or anything. Can only be stable with AIDA64 but remains stable on everything that I do.
With pretty good temps on a Silver Arrow. That will do for me on the stability side I guess.
Can still push to 4.8 with + 0.100 on the V's but on this MOBO, it's not worth the temps and the performance gain is overshadowed by those frequent lock-ups. (board limit I guess)
Anyway, I found things that is both good and bad about this MOBO. I have no idea whether some of you guys were on this already so I will bring this up in a hope to find a solution from more experienced guys out here. I have tried the following settings: UD3 Rev 3 owners can try this.
Blck at 200 X 23 to give me 4.6
CPU-NB at 2400 or X12 (stock at X11 or 2200)
HT link at 2600
1866 Ram at 9-11-9-27-1t
You'd be surprised as I am.
My benchmark scores with the settings above were up by a hefty minimum of 5% on every CPU test I run. Plus, my RAM latencies were also shaved by about a couple of nanoseconds on AIDA64. Mind you my 4.667 at 267 Blck can already be compared to some 8350s running at 4.8. For example, these 2 submissions I have with Passmark.
This is a 9370 running @ 500 Mhz more.
Now, back to CPU-NB at 2400, that >5% increase can, I think, be compared to a 5GHz 8350. I know that's too much to compare with as I can only confirm this with my runs on Passmark, Cinebench. And most of the guys never trust Passmark.
But you can try this with your board.
The reason I brought this up is actually to seek some tips from you guys about a problem with that set-up.
CPU-NB frequency or multiplier on a UD3 rev3 I think is also tied to the PCIe clock. And that's a bad thing. As I can confirm this when testing Direct 3D tests. on Direct 3d 10 specifically. I cannot pass a test. My system would crash DX 10 as if my card was OC'd hard. But they're running at their stock speeds.
Is it my card not able to handle that OC'd CPU-NB? I don't think so as I am running on same CPU-NB frequency with a Bclk of 267. 267 X 9 = 2403. So my hunch it's the multiplier that was linked with the PCIe clock.
Now if there's only a way to stabilise this...