As we've said must be very hit or miss on the cards as the 2 I have bought well over a month apart are ok
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7950 Crossfire Usage issues..
- Thread starter MOOGLEYS
- Start date
As we've said must be very hit or miss on the cards as the 2 I have bought well over a month apart are ok
Just come back after the pc being off for an hour or so and it's back jumping about all over the place again.
I have now officially given up.
If anyone is following this thread, if you suffer from the spiking core problem, set core voltage to 1251mv and press apply, this will disable the stock 'boost' and eliminate the core spiking.
Imo, you need to use His iTool for full core/vram voltage control as it's the only 100% working core/vram voltage tool that works on the His cards.
If anyone is following this thread, if you suffer from the spiking core problem, set core voltage to 1251mv and press apply, this will disable the stock 'boost' and eliminate the core spiking.
Imo, you need to use His iTool for full core/vram voltage control as it's the only 100% working core/vram voltage tool that works on the His cards.
Just tried 1251mv and it still spikes.
Just tried 1251mv and it still spikes.
With HIS iTurbo?
Yes only one I have installed now. The core clock still jumps about quite badly.
Uninstall all oc tools-AB-His iTurbo.
Install Trix>Open CCC and select defaults, apply and exit CCC.
Launch Trixx>Settings-Load on windows startup>and start minimized>and restore clocks>force constant voltage.
Overclocking>set core@1251 apply.
Install Trix>Open CCC and select defaults, apply and exit CCC.
Launch Trixx>Settings-Load on windows startup>and start minimized>and restore clocks>force constant voltage.
Overclocking>set core@1251 apply.
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All done and no better. Card is coming out now and being returned with the one with the borked fan. I have given up and have wasted to much time trying to work it out.
Ok, I edited my other post as to clean out all oc tools if you hadn't already, but if you had removed all tools and reset CCC, maybe it would have done the job, but understand the grief you don't need.
Perhaps there is a fault with the gpu, but it's going back now, so it doesn't really matter any more.
Perhaps there is a fault with the gpu, but it's going back now, so it doesn't really matter any more.
I think I found a way to "fix" this problem.
If you go on His iTurbo Settings and "tick" on "Disable 2D clocks", the card looks to hold the Boost clock (925) all the time without changing it.
The downside is, when you are not playing, you need to "untick" the "Disable 2D clocks" or the card will be running at 925mhz even on desktop.
If you go on His iTurbo Settings and "tick" on "Disable 2D clocks", the card looks to hold the Boost clock (925) all the time without changing it.
The downside is, when you are not playing, you need to "untick" the "Disable 2D clocks" or the card will be running at 925mhz even on desktop.
Two fixes, both work.
You can either increase the power limit to 30% as in this thread. That is the easiest solution. You need to re-do it every time you install a new driver. Setting the limit to 30% will stop the card from throttling even with a hefty overclock.
Or you can do the bios flash, which is by far the best way as it removes the boost crap and enables a higher power tune limit. Boost bios flashing thread
Thanks mate. Both look complicated, the bios flash obscenely so. The first might be within my means, however. The only bit that looks a bit baffling si where the OP says "Find your other gpu and export the reg entry again". How the **** would I do that?
The bios flash is pretty easy actually. You should have a bios switch on your card so if anything goes wrong you can just flick the switch bios position 2 and you'll be back safely on the default bios.
Your other gpu will be 0001 (assuming you have two gpu's) or something like that. Here's what mine look like.
0000 is my first gpu and 0001 is my second gpu.
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I can show you how to do the bios flash if you like, its the better solution of the two as its a one time thing only.
You might want to write this down...
You need to create a bootable usb stick.
1. Download and install the USB disk format tool here.
2. Download the Windows98 system files here.
3. Create a folder called Win98boot on your desktop, extract the files from step 2 into the folder.
4. Plug in your usb stick. Launch the USB disk format tool. Copy these settings, then click format. You need to select quick format, tick dos startup and select the Win98 folder, like ive done below.
5. Click start, then ok and it should do it.
6. Download atiflash. Extract it onto the usb stick.
7. Download the HIS7950.rom bios file. Cut and paste it into the usb stick.
8. If you've done everything correctly your usb stick folder contents should look like this.
9. Make sure all gpu's in your pc are switched onto bios 1.
10. Uninstall gpu drivers and any overclocking apps. Do not keep settings delete everything.
11. Restart your pc. Before you here the beep keep tapping F8. Boot from the usb stick.
12. You should be at dos prompt. Type atiflash -i to get the adapter number for both your gpu's. Typically it will be 0 and 1, unless you have a gpu in a third pci-e slot. You need the adapter number to tell it which gpu to flash.
13. To flash gpu 1 type atiflash -p -f 0 his7950.rom and hit enter.
Wait for it to finish. It will prompt you to restart but before we do that we need to flash the second gpu as well.
Now do the second gpu (if you have one)
Type atiflash -p -f 1 his7950.rom
Once that has completed and you get a notification saying you can restart press Ctrl+Alt+Delete to restart your pc.
All going well you should get a display and boot back into windows. Now you can reinstall fresh new drivers etc. Boost voltage and boost clock is disabled, your card thinks its a non boost card from now on in and you have the option to select 50% power setting as standard with every driver install.
If something goes wrong and you get no display from the cards after flashing the bios. Turn the pc off and flick both cards bios switch to position 2 to use the stock backup bios. Turn the pc back on and all will be ok.
Good luck.
No blaming me if it goes wrong though, not that it should.
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Thanks mate. You really are a star. A couple of questions if that's OK:
1. You refer to Windows 98. I'm running Windows 7. That all OK?
2. I came across this method. Looks a little easier?
3. Would I overclock as normal after this? Do I have to avoid Afterburner as I've seen mentioned elsewhere?
4. I presume the change is permanent. That is, unless I flick the switch back?
1. You refer to Windows 98. I'm running Windows 7. That all OK?
2. I came across this method. Looks a little easier?
3. Would I overclock as normal after this? Do I have to avoid Afterburner as I've seen mentioned elsewhere?
4. I presume the change is permanent. That is, unless I flick the switch back?
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