GTX 750Ti 4GB problem

oto.ulrich · Jan 6, 2018

Hey guys, so I've recently got a not too much used GTX 750 Ti 4GB OC from a friend, it runs just fine but whenever I use a GPU detection software it shows me only 2GB of VRAM instead of 4GB. Also GTA5 showed me only 2GB when I looked in the settings. I'm not really good at these things, can someone help me? Is it a software or a hardware problem?
Thanks
Oto

RememberThe5th · Jan 6, 2018

Download GPU-Z and screenshot it and post here.

richiestang_78 · Jan 6, 2018

Download the latest drivers for the card form Nvidia, then when you run the driver installation select the Custom Install option then check the Clean Installation box and then install it.

After restart your computer, when you are back at the desktop right click on the desktop and go to the Nvidia control Panel and at the bottom left there should be text that says System Information, click on that and it should display everything about your card. If it is displaying the 4gb then GTA and the other software is wrong.

dontlistentome · Jan 6, 2018

Those cards mostly had 2gb vram. I'm not saying there's no such thing as a 4gb model, but the fact it's so rare might be why certain detections won't 'see' the extra ram. Some software might detect "750 Ti" and just assume that means 2gb vram.

oto.ulrich · Jan 7, 2018

First of all there is a screenshot of GPU-Z.

oto.ulrich · Jan 7, 2018

Secondly I did what richiestang_78 told me to do but still shows 2GB of dedicated video memory.

RememberThe5th · Jan 7, 2018

Can you ask your friend does he have original CD that came with it?
One odd question, can you look for sticker behind card it should say smth like GV-N75TOC-2Gl and type it here(soo we know which model is it).

oto.ulrich · Jan 7, 2018

I guess he hasn't got the CD that came with it but what would that be for? Regarding the sticker I already looked like a week ago and it was this GV-N75TWF2OC-4GI.

Mark RM · Jan 7, 2018

Your GPUz screenshot shows you are running a 2GB ROM, regardless of all the rest. Effectively it's telling the drivers and GPUz you are running a 2GB card. I have seen this before as a work around on faulty cards when the last 1/2 of the VRAM is showing errors you get lucky by basically shutting it off and making the card still work.

The actual ROM for you card should be 82.07.55.00.B5 as far as I know.

Edit; this is the unverified BIOS, I'd be wary of this but it might be worth a shot if you have another card for backup so you don't have to flash blind if you brick it.
https://www.techpowerup.com/vgabios/181728/181728

You have a 4GB card that's been flashed to a 2GB card.

http://www.tomshardware.com/faq/id-2288384/upgrade-gpu-bios.html

Only ROM I can find is unverified, I'd try to get the original from Gigabyte support.

Edit; this is the unverified BIOS, I'd be wary of it but it should be worth a shot if you have another card so you don't have to blind flash it if you brick it.
https://www.techpowerup.com/vgabios/181728/181728

oto.ulrich · Jan 7, 2018

Hey Mark, thanks for your answer but as I said I'm not really good at this, can you tell me what does it mean to me? If the graphics card is faulty, it has still got varranty so that's no problem or is it supposed to work like this?

Mark RM · Jan 7, 2018

oto.ulrich :

I understand you don't understand , the hardware on the card is 4GB, the BIOS on the card is 2GB. That means programs can only see 2GB. That's a fault.

If it's under warranty, it has the wrong BIOS, which someone put on there at some point. Contact Gigabyte and get them to fix it.

oto.ulrich · Jan 7, 2018

Okay thank you so much for your answer but can't I change the BIOS on it by myself or is it too hard to do it with the equipment I have? I've also read somewhere that the Gtx 750Ti chip can't utilise the 4GB memory so it is pretty much useless, is it true?

Mark RM · Jan 7, 2018

You're mixing your thoughts. The 750Ti being arguably not powerful to fully utilize 4GB is one thing, maybe true, maybe not, depends entirely on the use you put it to.

Yes you can change it, I linked all the how to and what BIOS and a caution in my post above, that's as clear as I can make it. Given how unsure you are, I wouldn't touch it, I would get Gigabyte to do it.

oto.ulrich · Jan 7, 2018

Okay I got to know everything I wanted to, thank you so much again, I have got 1 more question not regarding the topic too much. Should I be able to run GTA 5 with this GTX 750Ti, a Q9550 CPU overclocked to 3.27 GHz and 8GB of DDR2 memory? So far I tried running the GTA5 benchmark on the lowest settings possible and it ran on 70FPS outside the city but when it got to the city it dropped to about 30-40FPS. Is it a problem with the GTA5 being poorly optimized or something else?

RememberThe5th · Jan 7, 2018

oto.ulrich :

No GTA is mostly CPU hungry, i've run it with Q6600 stock and R7 250 mostly 30fps low and 720p with some stuttering, if during benchmark didnt stutter you're fine, but what you know, without playing game actually you will never know!

oto.ulrich · Jan 7, 2018

I've tried running even GTA online but it's quite annoying when I get like 28FPS inside the city on the lowest details, I tried even higher details and the FPS were pretty much the same which made me kinda sad

I thought that 3,27GHz 4cores would be enough to run it atleast at 50FPS no matter what.

Mark RM · Jan 7, 2018

No, that game just needs a modern CPU at a high frequency, just how it's designed. Haswell (4th gen) i5's/i7s and later CPU's running at over 4Ghz are ideal.

oto.ulrich · Jan 7, 2018

So you are saying that it's normal that I'm running it at that low FPS?

Mark RM · Jan 7, 2018

That's what I'm saying.

oto.ulrich · Jan 7, 2018

There is 1 more thing, now I removed the overclock from the CPU and now the GTA 5 is running at even higher FPS than it did at 3,27GHz. Can someone please explain it to me?

RememberThe5th · Jan 7, 2018

oto.ulrich :

Probably you lowered speed on ram soo much that it was too slow

Mark RM · Jan 7, 2018

Two possible reasons - your CPU is currently running at stock a "happy divider" with your memory that allows for great throughput, either 1:1 or 2:1 or something that works well. When you OC you might be screwing that up.

The second possible reason is, your CPU is throttling back with higher temperatures when OC'd.

HWMonitor is your friend.

oto.ulrich · Jan 7, 2018

When I play GTA 5 the CPU temp goes up to 100°C with or without OC but I've read that that is normal for Q9550

Mark RM · Jan 7, 2018

You've been reading wrong then, once that hits 95c-100c it throttles like a SOB. Normal is under 90. preferable for life expectancy is under 80.

oto.ulrich · Jan 7, 2018

Anyway, a Q9950 (9950 is probably a typo because it was an answer in a 9550 topic) doesn't even start to throttle till 95-100C, and won't shut it self off till 127C. I've read this. But anyway what could I do with these temps, even without OC it goes up to 100°C. Btw. im using Arctic Cooling Freezer 7 Pro

GTX 750Ti 4GB problem

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