Topic Title: AMD HD 7990 Computer Freezing
Topic Summary: New Graphic Card Computer Crashing
Created On: 11/04/2013 01:12 PM
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 11/04/2013 01:12 PM
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Joined: 11/04/2013

Hello, i have recently bought a new graphic card and monitor, i bought the AMD HD 7990 and as screen i bought the asus PB278 which goes up to 1440p.

Now before my pc used to work fine and i could play all games, but now that i have put in the new graphic card and the new screen as soon as i start a game, the screen freezes or goes gray or black. I can still hear sound but i cant move my mouse or use alt + tab or ctrl + alt + del. It either does this or when i start a game the screen is moving down. I will have a fixed picture of the main menu of the game but behind it its another one moving around falling from up the screen to the bottom. Every time i start a game this happens and i need to reboot my pc, I don't know why this is happening and have been looking on alot of forums but i cannot find any awnsers, its making me very upset... I also tried to see if it might be because im running on 1440p but the same thing happens in 1080p.

I also like to note that i did reinstall my pc so its a totally new clean version and reinstalled the drivers for the graphic card like 5x aswell.

The weird thing is, i can run one game that i play mainly it's called League of Legends. It did crash 4 or 5 times in the start but after trying the AMD beta drivers and disabling the vertical sync and putting the frame rate uncapped it is working fine now and i can play it without it crashing or acting weird.

I don't understand why i can play League of Legends but any other game crashes or freezes or does something it should not do. I am totally clueloss on how to solve this problem and would really appreciate any help. Sorry for my bad English.

I Also like to note that i am using a DVI-D Dual link cable, as i read somewhere that i might need to use a DVI-I dual link but i am not sure how this would help. And i read somewhere else it could be caused by having speakers and cables near ur DVI cable. I have a HUGE surround system quite close to my monitor and pc and alot of cables, but i have had this with my old screen and graphic card aswell and never had this problem.

Here's my system specs:

Operating System: Window 7 Ultimate 64-bit SP1

CPU: Intel Core I7 2600 @ 3.40GHZ Sandy Bridge 32nm Technology

RAM: 16.0GB Dual-Channel DDR3 @ 686 MHZ (9-9-9-24)

Motherboard: ASUSTeK Computer INC. SABERTOOTH P67 (LGA1155)

Graphics: ASUS PB278 (2560x1440@75hz)
3072MB ATI MD Radeon HD 7900 Series (ATI)
3072MB ATI MD Radeon HD 7900 Series (ATI)
Crossfire Disables

Hard Drives: 932GB Hitachi HDS721010CLA332 ATA Device (SATA)

PSU: MS-N750-VAL | 750 Watt ATX PSU

 11/05/2013 03:41 PM
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Alpha Geek

Posts: 1553
Joined: 07/13/2009

Dual Link DVI is a digital interface.  DVI-I just means the cable has pins for both digital and analog.  They are unused with a Dual Link interface.  You don't have a cabling issue.

The real cause of your problem is your power supply.  Calling that unit "750W" is bona fide dishonesty.  If you add up all the max power of all the voltages, it just reaches 750W, but that's only on paper.  There is no way you'd ever be able to draw 750W from that unit, no matter how you balance the voltages.

Let's examine how it compares to a Corsair TX750.


3.3V - 30A (99W)

5V - 36A (180W)

12V1 - 19A (228W)

12V2 - 19A (228W)


3.3V - 30A (99W)

5V - 30A (150W)

12V - 62A (744W)

The total power for 3.3V and 5V combined will be the 5V total, so you can see that your MS-TECH unit can provide only 636W max, ignoring standby power.  And too much of that is on voltages not used by either the CPU or GPU's.  Not only do you only have 456W total 12V power, but it's split up into two rails.  At best, the 7990 will have one rail to itself (via the PCIe connectors), which gives it 228W of power - well below what it needs to draw at load.

So your problem is that your power supply is being overloaded, dropping voltages far below spec, and causing your system to lock up.

Your solution is to buy a proper power supply to replace it.  I would go with a single-rail 850W or better unit.  I'd recommend sticking with Corsair or Seasonic, to keep it simple.  If you're spending less than $100, you're likely buying junk.


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