HD 7750 not displaying at high resolutions?

cubby1223

Lifer
May 24, 2004
13,518
42
86
I've wanted to upgrade my video card for a while, have an HD 4670, and saw an HD 7750 that looked perfect for me. Bought it. Installed it. Displays in most resolutions, but not my monitor's native 1920x1200.

My 350W power supply isn't recommended, but it's a good power supply and shouldn't be preventing the card from displaying a 2D desktop, I suspect something else is going on.

Noticed in Catalyst Control Center the option "Reduce DVI frequency on high-resolution displays" with the extra info "Enable to resolve display corruption, or no image, when your display is set to a high resolution timing (e.g. 1600x1200@60hz)."

This is the exact description of my problem, all resolutions work through DVI except 1920x1200, 1920x1080, and 1600x1200.

I can use the dvi > vga adapter and connect the HD 7750 card to my monitor @ 1920x1200, and can play any video game I want with no stability issues.




Athlon II X3 440
Sparkle 350W PSU
Asus Geforce6150 motherboard
Windows XP, or Windows Vista, problem exists in both
Catalyst 12.3, or 12.4 problem exists in both
Gateway LP2407 24" monitor
no overclocking of anything

To test, I did a clean install of Vista on a new hard drive and the problem exists, so there is no virus/malware, no 3rd party software issue, anti-virus software, old left-over drivers, etc.

What's the most likely culprit? Video card? RMA it? Or refund it & stick with my HD 4670? Wait for the next version of AMD drivers? Spend money on a power supply that I am doubting will solve this issue?

(I also have an email in with Sapphire, awaiting their response too)


Thanks much!
 

Stuka87

Diamond Member
Dec 10, 2010
6,240
2,559
136
I am wondering if there is a driver issue with Vista. I highly doubt its a hard ware issue. This sounds entirely software.

Have you tried going and setting the mode manually, rather than choosing one of the recommended modes from Windows?
 

cubby1223

Lifer
May 24, 2004
13,518
42
86
Thanks

What is weird is, if in Vista, and no video card driver is installed, all resolutions work except for 1600x1200, 1920x1080, & 1920x1200. When I install the Catalyst drivers, those 3 resolutions still do not work, and 1152x864 now no longer works. If I uninstall the catalyst drivers, 1152x864 becomes usable again.

In XP, I tried to specifically select 1920x1200@60hz from both the catalyst control center, and from the normal windows advanced settings, neither worked with the 7750 card I have. When I had Vista running, I do not recall seeing the spot to specifically force a resolution/refresh rate.

My gut instinct says driver issue, but it'll be a month for 12.5, and if that doesn't fix my issue I'm back to square-one. (I've sent feedback to AMD as well, don't know if anything will come of it)

I don't particularly want any other card except this one, it's fanless, it's powerful enough for my wants, and the idle power consumption is very small (won't be a space heater in the middle of summer!)