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Sapphire 7970 Toxic Not Overclocking?!?! (Solved)

post #1 of 15
Thread Starter 
Ok, so a few months ago, I purchased the sapphire 7970 toxic from amazon. I was upgrading for crysis 3 (coming from dual 5770's) and running eyefinity. Threw it in and everything runs great as to be expected. However recently, I was looking forward to pushing it a little harder to get that little more performance on crysis 3 and other demanding games. Just about everyone that I have seen that has one of these toxic 7970's has pushed it to 1200mhz and even over 1300mhz with no problem! I can't seem to break 1175 without major artifacts or crashes. Memory overclocks fine, got it up to 1700 no problem. I am bench-marking with furmark and I have artifacts if it is set past 1175. Any suggestions? Also, for anyone that has done this before, what did you use for the power settings because I have tried virtually everything and nothing seems to change results. Also, Should I have the lethal boost enable when overclocking or disabled. I currently have it enabled.
Thanks in advanced, Josh smile.gif

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post #2 of 15
Have you increased the GPU Voltage at all? In my expirence, the power settings just cause an unstable overclock, I would suggest leaving it at 0. Try downloading MSI Afterburner or Sapphire TriXX to overclock it properly by increasing the GPU voltage every 25 MHz steps when needed.
post #3 of 15
Thread Starter 
Oh yeah, forgot to talk about the software. Ok so I am using the latest version of Trixx, I also have afterburner and ASUS GPU tweak, but when I increase the voltage in trixx, afterburner doesn't show any increase on the moniter. It just stays at 1256mv. Also on TriXX, does the VDDC voltage control the core voltage, the memory or both? Thanks for your help btw
post #4 of 15
Quote:
Originally Posted by s28400 View Post

Oh yeah, forgot to talk about the software. Ok so I am using the latest version of Trixx, I also have afterburner and ASUS GPU tweak, but when I increase the voltage in trixx, afterburner doesn't show any increase on the moniter. It just stays at 1256mv. Also on TriXX, does the VDDC voltage control the core voltage, the memory or both? Thanks for your help btw

Just use Afterburner and uninstall the other 2 programs
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post #5 of 15
I would suggest downloading GPU-Z and going into the senors tab and monitoring the voltage from there. If I recall correctly, TriXX does not let you control the memory voltage, correct me if I am wrong though. MSI Afterburner I know does let you control the memory voltage by click the down arrow on the top right of the core voltage. I've had more luck with Afterburner so I recommend overclocking with that and make sure the settings stick by referecning with GPU-Z. If your card fails to be stable even after you increased the voltage as necessary, then your card is on the low end of overclocking and nothing can be done. redface.gif
post #6 of 15
Thread Starter 
Ok, so I went into Afterburner, and when I click on the core voltage arro, it drops down Memory voltage, core voltage, and Aux voltage. Core and Mem are greyed out but not Aux. Is Aux voltage like the power tune or something different. It is set at the max by default @ +550mV. Also, when I go into GPU-Z, it shows the VDDC at 0.875V and the current at 27 amps under load. Can't seem to get it to change. I did however seem to get a stable overclock with the TriXX witha core of 1210mhz and voltage @ 1150 according to TriXX. Not sure what to make of this though blushsmiley.gif
post #7 of 15
Quote:
Originally Posted by s28400 View Post

Ok, so I went into Afterburner, and when I click on the core voltage arro, it drops down Memory voltage, core voltage, and Aux voltage. Core and Mem are greyed out but not Aux. Is Aux voltage like the power tune or something different. It is set at the max by default @ +550mV. Also, when I go into GPU-Z, it shows the VDDC at 0.875V and the current at 27 amps under load. Can't seem to get it to change. I did however seem to get a stable overclock with the TriXX witha core of 1210mhz and voltage @ 1150 according to TriXX. Not sure what to make of this though blushsmiley.gif

Seems like you need to enable unoffical overclocking on Afterburner to adjust the voltage and core voltage past CCC limits. After you enable that you should be able to adjust the voltages using Afterburner. But a 1210MHz overclock @ 1.150v is incredible, kinda too good to be true, are you reading that off GPU-Z? Fire up a benchmark or a game and see the VDDC that GPU-Z reports under load.
post #8 of 15
Thread Starter 
I tried that unofficial thing a while ago, can't seem to get it to work though. I followed that tutorial but the voltage sliders are still grayed out. hmmm. Oh and the 1.150v was according to the TriXX voltage slider. GPU tweak still reads 0.875 for some reason... even under load. The ASUS monitor says 1.256v which seems more reasonable but again, can't seem to adjust the voltage.
post #9 of 15
Use GPU-Z or HwInfo for the real voltage, since this information is conflicting smile.gif

Good luck with your OC! [1175 is nothing to scoff at, and 1210 is great!]
post #10 of 15
It sounds to me like half the programs you are using are not properly reading your card. It is one of the newest non reference models so this shouldn't be a big surprise.

Personally if I can't get things working right I uninstall all the tweaking programs - and just run Sapphire Trixx. It's the only one I've never had to mess with "unlocking" and generally on a 7970 overclocking the memory should be your last concern. (so much memory bandwidth at stock speeds - not a limiting factor)

Install GPU-Z - it will at least accurately read your on board temperatures and voltages - and hopefully everything else.

Set the voltage to something you know it can handle easily (like 1.2V) and see how high you can get the core without artifacts. My 7970 is stable at 1315 at 1.22V, but at 1.24V even lower speeds are unstable.

My cards stock voltage is 1.175V, but it will run 1250 core stable at 1.12V - sometimes you just have to play around with things to find what works best for your card long term. I will probably keep mine at 1250 forever.
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Ginormous M-ITX
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