I have a 7990 the XFX reference card, and I was trying to over clock it but it seems that whenever I try to overclock the memory frequency my PC freezes..
I was thinking it's the PSU at first but I increased power to 120% and ran benchmarks with heaven's bench 4.0 ran fine, overclocked the GPUs.. to 1005 MHz gave me a bit of a boost in perf. but when running at 1010 MHz GPU freq. I get less performance...
tried increasing the Memory freq. and at 1505 (x4 = 6020 MHz) My PC freezes.
(I always have the fan RPMs set to 100% when trying to see a stable overclock)
PC freezes instantly once the high gear in the Grafix card is engaged
Specs:
i7-3770 non-k OC to 4.3 GHz
4x4 GB 1600 MHz Kingston Xtream RAM
Gigabyte Z77X-D3H MB
2x Samsung 840 Pro 512 GB in RAID 0
2x Velociraptor 600 GB 10,000RPM HDD in RAID 0
a total of 9 fans running in the case for optimal airflow
PSU Cooler Master GX750 80+ bronze
http://www.coolermaster.com/powersupply/gx-series/gx-750w/
please help me out here, I'm new to overclocking but I'm not a complete n00b, I want to overclock this card and see it's potential but I'm not able to, please assist
[Update]
forgot to add, I'm using Windows 7 Ultimate SP1 with the latest updates and drivers.
AMD GPU driver 14.9.2 (yes the one for win 7 not 8/8.1)
[Update 2]
I did some research and it turns out I can increase the VDDC and overclock the GPU and now I'm getting better results, problem is it looks like the MVDDC is locked so I can't overclock the memory, I can't increase it, searched high and low for something that can help, but it looks like I don't even have a MVDDC sensor on my card, any ideas ?
I was thinking it's the PSU at first but I increased power to 120% and ran benchmarks with heaven's bench 4.0 ran fine, overclocked the GPUs.. to 1005 MHz gave me a bit of a boost in perf. but when running at 1010 MHz GPU freq. I get less performance...
tried increasing the Memory freq. and at 1505 (x4 = 6020 MHz) My PC freezes.
(I always have the fan RPMs set to 100% when trying to see a stable overclock)
PC freezes instantly once the high gear in the Grafix card is engaged
Specs:
i7-3770 non-k OC to 4.3 GHz
4x4 GB 1600 MHz Kingston Xtream RAM
Gigabyte Z77X-D3H MB
2x Samsung 840 Pro 512 GB in RAID 0
2x Velociraptor 600 GB 10,000RPM HDD in RAID 0
a total of 9 fans running in the case for optimal airflow
PSU Cooler Master GX750 80+ bronze
http://www.coolermaster.com/powersupply/gx-series/gx-750w/
please help me out here, I'm new to overclocking but I'm not a complete n00b, I want to overclock this card and see it's potential but I'm not able to, please assist
[Update]
forgot to add, I'm using Windows 7 Ultimate SP1 with the latest updates and drivers.
AMD GPU driver 14.9.2 (yes the one for win 7 not 8/8.1)
[Update 2]
I did some research and it turns out I can increase the VDDC and overclock the GPU and now I'm getting better results, problem is it looks like the MVDDC is locked so I can't overclock the memory, I can't increase it, searched high and low for something that can help, but it looks like I don't even have a MVDDC sensor on my card, any ideas ?
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