first i want you to excuse my poor english skills but i got some questions that only here in this Forum may be answered.
I'm running a Sapphire HD5870 Custom Card (Blue PCB) and a XFX 5870 XXX ZNDA in Crossfire and are kind of stuck in my overclocking efforts.
Just because i've been out of luck another time, both cards are very unclockable running stock voltages, so finaly i got both of them voltmoded:
-The XFX Card is flashed with the latest MSI R5870 Lightning BIOS so i am able to adjust voltage in MSI Afterburner
-for the Sapphire Card i'm using a Pencil-Mod, wich pushed voltage up to 1.275-1.35V, depending on load
All measuring is done with a digital 4.5 digit multimeter direct connected to the card(s)
Yesterday all stuff was fine, i was able to clock up to 950MHz on both cards, using 1.190V on the XFX and playing BF3 for hours. Only the temperatures on the XFX raised up to nearly 90° Celsius so i bought a Arctic Accelero Xtreme and mounted it today. Now temperatures are all fine(63°C/69°C) on both cards, but i ran into new problems today:
When i raise the voltage for the XFX in AB, i always have to measure if its apllied, just because very often the new voltages aren't applied and i have to change in AB from User-mode to Kernel-mode and back or change from 1.125 to 1.165Vcore Type to get it work. That's very annoing because this needs everytime a AB-Restart and sometimes even a system reboot. Also it occours that the voltage is being resetet while on load so my graphics driver chrashes and is beeing reseted by windows.
Additional AB is not very reliable about the applied voltages, sometimes it applies 1.3V or more even when only 1.2V is considered....
So first question is:
Is it possible to get a lasting software voltmod for the XFX? I allready tried a modified BIOS using RBE and setting voltage to 1.25V, but this does'nt apply.
Would it be possible to flash a ASUS-BIOS to use another (more relieable) tool than Afterburner?
Or do i have to hardmod to the XFX-Board too? I'm not that fan of soldering on tiny graphiccard contacts, so a pencilmod or different tools would be welcome
Second question i got:
I figured out, that my bf3-perfomance increases drastically when i oc the memory from 1200MHz to 1250MHz or more when GPUs are clocked to 950MHz. This results in smooth 50FPS+ and stable 99% GPU-usage without any stuttering on both GPUs. but it won't last very long and i get a BSOD depending on atikmpag.sys, think that points to an unstable videomemory? Am i right about that?
Hopefully i could determine my problems :-)
- Asus M4A79 Deluxe
- AMD Phenom II X6 1090T @ 4.0GHz @ 1.5V(BIOS) ~45°C max after 10 Hours Prime95 FFTs + 3DMark 06 Loop; Air-cooled by Noctua ND-D14 using 2xScythe Fans @ 190m²/h
- 2x2GB/2x1GB; Totally 6GB DDR2-800 @ 833MHz
- XFX 5870 XXX ZNDA 1024MB @PCI-X 16x; Air-cooled by Arctic Accelero Xtreme 5870-->Primary CF-Card
- Sapphire 5870 Custom Blue PCB @PCI-X 16x; Air-cooled by Sapphire Vapor-X --> Second CF-Card
- 3x Samsung Syncmaster 22" Eyefinity @ 5176x1050px
- Chieftec CFT-750-14C 750W PSU
- Antec Three Hundred Case
- OCZ Vertex 2E 60GB System-HD
- Samsung Spinpoint S-ATAII 500GB 7200rpm Data-HD
- X-Fi Xtreme Gamer Fatal1ty PCI Sound-Card
- Windows 7 Home Premium x64 SP1; all Updates
- AMD Catalyst 12.1 WHQL clean installation
- AMD CAP 2 12.1
- MS Security Essentials
- Logitech Gaming Software
- MSI Afterburner 2.2 Beta 12 (had even more problems using 2.1 final)
Would be very happy if there is anybody with some useful suggestions.