GTX 750 Not Working Correctly

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applemacguy

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Mar 17, 2015
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Hi,
I have a computer that I built in March:
Motherboard: ASRock Z97M Anniversary
CPU: Intel Core i3-4160
Graphics Card: Gigabyte NVIDIA Geforce GTX750 1GB DDR5
Case: Cooler Master N200
Power Supply: Enermax NAXN Tomahawk II 500W
RAM: Corsair Vengance 8GB (2x4GB)
SSD: OCZ ARC100 120GB
HDD: Samsung ST500DMOO2-1BD142 500GB
2x Samsung 1TB

My graphics card worked fine and everything was good, then yesterday, I wanted to test if I could use my laptop as a monitor and plugged in a DVI-VGA adapter to my GPU. It wasn't until after I realised that I plugged it into the DVI-D which only sends out an analogue signal.
After that my graphics card turned on correctly but didn't show the ASRock boot logo, only the POST screen at a very low resolution. The Windows 10 loading screen comes up and then goes away leaving a blank screen. I also cannot access my UEFI BIOS. It seems like the card is underclocked and cant handle the load of a simple UEFI BIOS. I tried the card in another computer with the same result. I tried an HDMI cable instead of a DVI, same thing. Finally, I tried booting with the onboard graphics, switching the default AGP to Onboard and then rebooted with the graphics card in but the DVI plugged into the motherboard. I could then remove the NVIDIA drivers and boot with the GTX 750. But, because there were no drivers installed, it was in a really low resolution, about 800x600. As a last-ditch attempt, I tried to download a new BIOS for the card from Gigabyte and tried flashing it, but it won't work because they're the same.

I was planning on upgrading to a Gigabyte GTX 960 4GB anyway, but I'd really like this card working as a backup in case anything happens. It there anything I can do?

Thanks,
Roman
 
Solution
clutchc

That 3942 MB is what is available to the iGPU at max. It is slower DDR3 system memory. The same amount is available to the GTX 750 if needed. And the 750's dedicated VRAM is MUCH faster DDR5. No comparison. But at 720p rez, you won't use anywhere near that much. Probably not over 1GB w/the 750 and far less with the weaker iGPU. Don't be fooled by that available memory.
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clutchc

clutchc

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Huh? You plugged your laptop into your gfx card??!! You may have fried something. The gfx card OUTPUTS a video signal. The laptop's video ports OUTPUT a video signal. Connecting them is like a dead short between video outputs. Take the gfx card out of the PC and let it set for awhile. It may recover once it is removed from power for awhile. Or it may not.
 
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applemacguy

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Mar 17, 2015
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I was worried I may have fried something. I was experimenting to see if I could use it as a monitor. At least I was going to buy a 960 anyway.

I have left it to sit in a static-free bag overnight and still has the same problem. I'm thinking that it may have corrupted the graphics card BIOS because when I save it and try to edit with Kepler BIOS Editor, it get an error.

The weird thing is, in GTA V my onboard graphics outperform the 750 by up to three times. I use to have to have it in windowed mode on 800x600. Now with Intel(R) HD Graphics 4400. I can have fullscreen at 1920x1080.

 
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applemacguy

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Mar 17, 2015
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The 750 is 1GB and the iGPU is 3942MB, maybe that's why, but it's still great performance. I did the benchmark, and when it's fullscreen 1366x768, it runs at an average of 30FPS.

 
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clutchc

clutchc

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Apr 22, 2009
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That 3942 MB is what is available to the iGPU at max. It is slower DDR3 system memory. The same amount is available to the GTX 750 if needed. And the 750's dedicated VRAM is MUCH faster DDR5. No comparison. But at 720p rez, you won't use anywhere near that much. Probably not over 1GB w/the 750 and far less with the weaker iGPU. Don't be fooled by that available memory.
 
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