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Strange lag spikes

Last response: in Video Games
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December 7, 2012 2:02:32 PM

Hello, guys!
I'm new here, and I see that you guys are good helpers, so I'm here to ask for help. Also, sorry for my bad English. :na: 
I had a GeForce 9500GT 1GB and it was running games just fine... until the day Windows 8 came out. When I rebooted my PC to install Windows 8 64-bit, I realized my GPU was automatically shut down. As my monitor was blacking out for quite a while, I decided to open the case and take a look inside. The GPU's fan had stopped working for some reason (and it wasn't only that day; it was automatically shutting down due to overheat for the past 2 months and I didn't know what was causing it). I fixed it and installed Windows 8.
While on Windows 8, I noticed a HUGE performance drop. Games like Portal 2 and Half-Life 2-based mods used to run at ~60FPS or more, and it was now running at ~16 FPS with weird lag spikes. At first I thought the problem was Windows 8, so I moved back to Windows 7 64-bit. But it didn't fix it. Lag spikes were also present.
So I thought that the overheat caused permanent performance loss, so I bought a new GPU.
I now have a GTX 550Ti 1GB 192bit GDDR5, and instead of fixing all that lag spike stuff, it didn't. Well, in fact, the Source Engine games are running quite a bit better, but there are some strange lag spikes, freezing the game for about 1 sec at random times (2 seconds on average, maybe).
For instance, here's a benchmark test, according to Fraps 3.5.1:
Quote:
2012-12-06 16:56:05 - portal2
Frames: 3798 - Time: 74225ms - Avg: 51.169 - Min: 0 - Max: 63


So, only at the menu, it ranged from 0 to 63.

I've also tried Black Ops II, at the lowest settings possible. Here's what I got at the very first singleplayer mission:
Quote:
2012-12-06 18:25:44 - t6sp
Frames: 1315 - Time: 101230ms - Avg: 12.990 - Min: 4 - Max: 30


A few notes:
Drivers are up-to-date;
The CPU, GPU, RAM, HD temperatures are all normal;
Ran a MemTest, everything is normal;
Ran a HD defrag;
Closed all the unnecessary processes;
Reinstalled DirectX.

Windows 8 AND 7 had this issue, so I don't think it's OS-related.

TL;DR:
My old GPU overheated, everything started to lag. Bought a new GPU and it didn't fix. Temperatures are normal, Windows and drivers are updated.

Pleeeease, if someone can help me, I'll be extremely grateful and give you a virtual hug. :p 

More about : strange lag spikes

December 7, 2012 2:40:09 PM

What is your power supply unit? Are you sure it's strong enough for GTX 550 Ti? Did you check temperatures of your new card? Did you connect 6-pin connector from the power supply unit DIRECTLY into the graphics card?
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December 7, 2012 2:47:42 PM

Sunius said:
What is your power supply unit? Are you sure it's strong enough for GTX 550 Ti? Did you check temperatures of your new card? Did you connect 6-pin connector from the power supply unit DIRECTLY into the graphics card?

Corsair ATX 650W CMPSU-650TXV2. Yes, it's strong enough.
Temperatures are normal. Used MSI Afterburner while playing Portal 2. It's peak was 61ºC. Also tested with MSI Kombustor and the temperatures rised to no more than 73ºC. About the connectors, I'm not sure, but I think it's connected directly. I didn't install it, I was travelling. There was a cable with the 6 pin on one side, and two with 4 connectors on the other side. I dunno if someone used it to install the GPU, but I can't find that cable. Maybe that's it.
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December 7, 2012 3:40:39 PM

You don't need to use that. Could you open the PC and check whether it's connected?
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December 7, 2012 7:27:43 PM

Sunius said:
You don't need to use that. Could you open the PC and check whether it's connected?

Just checked it. To my surprise, it's not a Corsair as the paper says. It's a LPJ2. I don't know much about it, but it says 500W.
Also, I couldn't find the proper 6-pin connector coming out of it.
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December 7, 2012 8:20:56 PM

So there's nothing connected to the card? That might explain all your problems whatsoever. Could you take a photo of that power supply unit? You might need to call the guy who seemingly installed the "WRONG" PSU and took money as if it was decent.
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December 7, 2012 9:30:10 PM

Sunius said:
So there's nothing connected to the card? That might explain all your problems whatsoever. Could you take a photo of that power supply unit? You might need to call the guy who seemingly installed the "WRONG" PSU and took money as if it was decent.

In fact, aside from being connected to the motherboard, it is connected by the aforementioned 6-pin power adapter cable, since there's no 6-pin cable coming FROM the PSU.
http://puu.sh/1yjGk
http://puu.sh/1yjGv
http://puu.sh/1yjH5
http://puu.sh/1yjHj
Yeah, shitty focus, shitty images. If you want, I can rewrite it.

EDIT: I read somewhere that if I get the *number*A in the +12V section of this sticker and multiply by 12, I would get it's real power in Watts.
It says "20A". 20 * 12 = 240. According to http://www.extreme.outervision.com/psucalculator.jsp, my current setup needs > 279W to run. Is this correct?
Ah, anyways, I think I'll do that. I'll talk to him and try to get my money back or change to a better PSU for free.
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Best solution

December 8, 2012 9:30:07 AM

Yes. If that power supply does indeed have only 20 amps on the 12V rail, there's no way it's enough for your computer with GTX 550 Ti.
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December 8, 2012 2:13:44 PM

Sunius said:
Yes. If that power supply does indeed have only 20 amps on the 12V rail, there's no way it's enough for your computer with GTX 550 Ti.

Oh well, ok then.
Thank you very much for you help! :D 
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December 8, 2012 2:14:10 PM

Best answer selected by bokirov.
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