TimEG said:
Hi guys, I'm a new member so firstly hi to everyone here. Some interesting info on this site so keep up the good work.
I've just got my x1900xt and I'm having a few probs OC'ing it even after following all the advice on this forum. Using CCC is says that I can pretty much run at the max settings but no matter what I set the sliders too it makes no difference to my benchmarks. The actual value says 500/600 and it remains like that, even when I'm running a 3D application. Does this mean that my games are running at 500/600?
Using ATI tools I tried setting the VGPU to 1.3 and then the clocks to 650/775 (Same as the XTX) and it works fine. I find that I get an extra 10 frames in F.E.A.R this way but when I run the artifact scanner in ATI Tool I can hear a strange pulsing coming from the GFX card. Does this mean I'm damaging the card? It doesn't make this noise in game, only when checking for artifacts.
I only really want to run at XTX speeds, no higher. Why can I gain extra FPS if I use ATI tool but not CCC even when I set to the same value?
Any ideas greatly appreciated!
I suggest you do not use the scanner any more, no on uses it on the x1000 series like they did with the x800 series.
I also suggest you find a way to cool your mosfets and vregs. I use a 80mm fan with ram sinks and have my x1900xtx oc using ATI Tool to:
720/837.5
1.425 VGPU
2.113 MVDDC
2.113 MVDDQ
1.498 VDDCI <-cranking this up to the settings you see now helps stabilize and increase min/low FPS for me.
Stock cooling, witha lapped HS and a 80mm fan on the Vregs/mosfets...
I set 3D-Dection to load my profile
I set 3D-Detect to load default profile when application closes.
Remember this core is very touchy about heat. The more heat the less it performs. On average if you can keep it within 65C under load you shouldn't have any problems with performance. However, you must keep the vregs and mosfets cool (refer to 1st post).
It appears to me that the Vgpu runs best at:
720 @ 1.4000V <--for me this gives slower benchmark results
720 @ 1.4250V <--for me this gave better benchmark results
for my x1900xtx. However, for everyday operation 720 is the best I can do to keep heat down. If you want to do 725 you will need to crank the Cgpu to 1.5000V which causes a lot of heat for me. Maybe your VC will do 725GPU @ 1.4500V however, mine crashes during 3dmark 06.
As for Mem, so far I have only gotten to 837.5 using ATI TOOL. I have tested using high and low votlage for the mem and it made no difference for me. Therefore I leave it at:
2.113 MVDDC
2.113 MVDDQ
ALTHOUGH I HAVE GONE AS HIGH AS
2.203 MVDDC
2.203 MVDDQ
BUT AGAIN NO added bonus. AT 2.206 it froze but there is a catch to this, read on!
It appears that the use of VDDCI is some sort of Voltage GateKeeper (if you will), when I leave it at default 1.486V my benchmarks on 3d06 would dip to the low teens. When I crank it up to 1.498V it would be more steady with less dips (using the example I gave earlier in this post). That is why I have it cranked up. But, at 1.5000 it always get artifacts (something I haven't seen until I started tweaking the VDDCI, before it would either freeze or CTD). Although this is just a guess it appears 1.5000V for VDDCI is simply to much and making the VC very hot causing artifacts, again just a guess. OCers who use 1.5000 VDDCI are clocking the core over 725 and mem over 835 so it makes sense to for me to believe that 1.498V for the VDDCI is ample power until you go much higher in your OC. By then you should consider watercooling because of the heat it generates.
In all this should point you in the right direction. Remember, these results are with me using a x1900xtx from ATI (not the other companys that make them). I cannot guarantee nor do I suggest this will work on a x1900xt or other x1900xtxs out there. These are my findings using the VC that I have.