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[Official] AMD Radeon HD 7950/7970/7990 Owners Thread - Page 3597

post #35961 of 38739
Quote:
Originally Posted by wermad View Post

run the 7990 at the bottom so it gets the best possible cooling (3rd red slot). The 7970 in the top slot is still good (top red slot).

wouldn't it be the other way round? or does he have spare slots after #7? (8 or 9 slot case)
   
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post #35962 of 38739
RIVF has four red pcie 16x slots, #1 & 3 run at 16x.
post #35963 of 38739
Hey guys,

Trying to overclock my 7970. I'm new to the game of overclocking so bear with me. ^^

So, I'm using MSI afterburner to overclock and OCCT's GPU tool / heaven benchmark to test for stability. So far, it seems that i've managed to achieve 1160 Mhz stable, on stock voltage. Now, the weird thing is that when I go over what's stable, ie 1170+ MHz, I don't get artifacts (well, OCCT's tools finds "errors"). Instead, heaven outright crashes but the computer itself runs fine. OCCT's thing will freeze the entire computer. Is this normal behavior for an unstable overclock? I thought I would see artifacts or something.

Also, I tried to up the voltage to make 1170 Mhz stable. I went from stock voltage (1175 mV) to 1190 mV. It wasn't stable either, so I'm guessing that I have to up the voltage even MORE to get to 1170 Mhz ?

a few pointers would be nice. ^^
post #35964 of 38739
Quote:
Originally Posted by incog View Post

Hey guys,

Trying to overclock my 7970. I'm new to the game of overclocking so bear with me. ^^

So, I'm using MSI afterburner to overclock and OCCT's GPU tool / heaven benchmark to test for stability. So far, it seems that i've managed to achieve 1160 Mhz stable, on stock voltage. Now, the weird thing is that when I go over what's stable, ie 1170+ MHz, I don't get artifacts (well, OCCT's tools finds "errors"). Instead, heaven outright crashes but the computer itself runs fine. OCCT's thing will freeze the entire computer. Is this normal behavior for an unstable overclock? I thought I would see artifacts or something.

Also, I tried to up the voltage to make 1170 Mhz stable. I went from stock voltage (1175 mV) to 1190 mV. It wasn't stable either, so I'm guessing that I have to up the voltage even MORE to get to 1170 Mhz ?

a few pointers would be nice. ^^
Driver crashes can occur on an OC that is very unstable. Artifacts occur on an unstable but not at the edge OC. Just volt it up a little till it works. Also programs like furmark and OCCT GPU tool just make the GPU hot. Benchmarks like heaven are great but they don't always show artifacts. The best thing to do is play a heavy game for a while. I usually play BF4 to test my GPU.
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post #35965 of 38739
Quote:
Originally Posted by incog View Post

Hey guys,

Trying to overclock my 7970. I'm new to the game of overclocking so bear with me. ^^

So, I'm using MSI afterburner to overclock and OCCT's GPU tool / heaven benchmark to test for stability. So far, it seems that i've managed to achieve 1160 Mhz stable, on stock voltage. Now, the weird thing is that when I go over what's stable, ie 1170+ MHz, I don't get artifacts (well, OCCT's tools finds "errors"). Instead, heaven outright crashes but the computer itself runs fine. OCCT's thing will freeze the entire computer. Is this normal behavior for an unstable overclock? I thought I would see artifacts or something.

Also, I tried to up the voltage to make 1170 Mhz stable. I went from stock voltage (1175 mV) to 1190 mV. It wasn't stable either, so I'm guessing that I have to up the voltage even MORE to get to 1170 Mhz ?

a few pointers would be nice. ^^

Quote:
Originally Posted by heroxoot View Post

Driver crashes can occur on an OC that is very unstable. Artifacts occur on an unstable but not at the edge OC. Just volt it up a little till it works. Also programs like furmark and OCCT GPU tool just make the GPU hot. Benchmarks like heaven are great but they don't always show artifacts. The best thing to do is play a heavy game for a while. I usually play BF4 to test my GPU.

To add on to heroxoot, are you using the Powerlimit slider in AB? I also use BF4 and Heaven to help test stability. What are you clocking your memory @? I can get my card stable @ 1150/1700 on stock 1112 voltage. I was able to get it higher by upping the voltage but the card throttles due to temperatures. You definitely want to watch out for that as well since you may not see artificats or crashes but you can lose performance. Good luck!
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post #35966 of 38739
Well I was given it a try this morning and I believe I managed to get 1160 core and 1590 memory clock stable, on stock voltage. It passed at least two runs of Heaven benchmark. However I'm not quite getting it to work on bioshock.

Again, the rig itself is fine but when I'm playing bioschock for example I get a blackscreen then it just tabs to desktop. I still have bioshock running in the background but I can't tab back to it.

This core overclock seems all right but I'm disappointed that the memory overclock is that low.
Edited by incog - 4/24/14 at 4:45am
post #35967 of 38739
Quote:
Originally Posted by incog View Post

Well I was given it a try this morning and I believe I managed to get 1160 core and 1590 memory clock stable, on stock voltage. It passed at least two runs of Heaven benchmark. However I'm not quite getting it to work on bioshock.

Again, the rig itself is fine but when I'm playing bioschock for example I get a blackscreen then it just tabs to desktop. I still have bioshock running in the background but I can't tab back to it.

This core overclock seems all right but I'm disappointed that the memory overclock is that low.

This is usually because of the Display Driver Crash,

When the Display Driver Crashes Programs running Direct3d/OpenGL/Mantle etc will crash or minimize after the screen goes black,

There's usually Events in the Event Viewer for the ATI Driver saying the Display Driver Crashed and was restored.

Which happens when there isnt enough Power to the GPU.

1160/1590 on Stock Voltage can be safe in Benchmarks, but in games it will be a different story, as you'll have more than just graphics rendering, you'll have high CPU usage, PCIe Lane Traffic, Northbridge traffic, etc.

i could run 1150/1600 all day on my 7950 at stock mv, and run endless looks in 3d Mark and Heaven, but 10 minutes into BF3 and I would get a display driver crash everytime, I had to increase mV or back off the clocks to stabilize.
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post #35968 of 38739
Quote:
Originally Posted by incog View Post

Well I was given it a try this morning and I believe I managed to get 1160 core and 1590 memory clock stable, on stock voltage. It passed at least two runs of Heaven benchmark. However I'm not quite getting it to work on bioshock.

Again, the rig itself is fine but when I'm playing bioschock for example I get a blackscreen then it just tabs to desktop. I still have bioshock running in the background but I can't tab back to it.

This core overclock seems all right but I'm disappointed that the memory overclock is that low.

Funny you mention Bioshock. I have experienced the exact same symptom you describe. I had seen it occur on beta drivers. Either your voltages are too low, or your OC is too high. Also keep in mind in case you're running Xfire, this particular game can't use multiple cards. Don't know if this contributes to driver crashing.
post #35969 of 38739
6gb 7970 on ebay for $350 w/ obo. Tempted but it needs a universal block setup to wc.
post #35970 of 38739
Quote:
Originally Posted by gr8sho View Post

Quote:
Originally Posted by incog View Post

Well I was given it a try this morning and I believe I managed to get 1160 core and 1590 memory clock stable, on stock voltage. It passed at least two runs of Heaven benchmark. However I'm not quite getting it to work on bioshock.

Again, the rig itself is fine but when I'm playing bioschock for example I get a blackscreen then it just tabs to desktop. I still have bioshock running in the background but I can't tab back to it.

This core overclock seems all right but I'm disappointed that the memory overclock is that low.

Funny you mention Bioshock. I have experienced the exact same symptom you describe. I had seen it occur on beta drivers. Either your voltages are too low, or your OC is too high. Also keep in mind in case you're running Xfire, this particular game can't use multiple cards. Don't know if this contributes to driver crashing.

Nah only a single 7970; if I'm the kind of guy who's learning how to overclock a GPU, I'm not the kind of guy to crossfire, am I?

Thank you all for the help everyone, I will try again tomorrow and see how it goes.
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