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Possible CPU issues & Prime 95 testing

post #1 of 3
Thread Starter 
I think I have put this in the right area. I've just recently put together a new rig for myself. I thought everything was okay with it the first few hours of having it on, I was wrong. I left the computer on while I went out for three hours, but I left youtube videos running. When I returned the computer was incredibly laggy, so much so my mouse cursor was lagging. Also I noticed some audio issues, such as some crackly noises and choppiness if I moved the mouse cursor a lot. I was thinking something was overheating but the CPU temps were perfect, all four cores were between 29-35. I also checked my GPU temp, it was 35. I reset computer and everything was perfect again. So I tried to recreate the situation with a different video card, I left youtube videos on for a few hours and I had the same issue, although it didn't seem as bad. I also noticed that if I had music on and would minimize a game there would be major sound lag I guess is the best way to put it, a loud choppy sound for a second or so after I minimized the game. I decided that maybe it was my sound card but I wanted to run some Prime95 tests to see if the same thing would happen, such as the general lag, and cursor lag. I first ran a custom torture test with the settings set like this:

I ran it twice, once for 7 hours, and again for 10 hours. There were no errors reported. All the temps were good, the 4 cores were between 48-55. I did notice that one of the workers would stop testing, or testing very slowly and would skip tests. There was no error though, so I wasn't sure what to make of it. Also what I noticed was when I would stop the torture test my CPU usage would drop from 100% to 11-15%, when generally the computer runs anywhere from 2-7% with a lot of fluctuating, I had to restart the computer in order to get the usage back to where it should be. Also from when I've run prime95 on other systems the usage would go back down to it's normal levels. Since I got no errors on that test, I decided to run a Small FFT torture test. I only ran this for 6 hours and 30 mins, I'll probably end up running a longer one eventually. Same thing though, one of the tests just kinda slows down, and stops doing all the tests, but there are no errors or warnings. This is what happened:

I started the test at 2:10 but you can see it starts skipping some tests around 5:16, only doing 9 of them and it steadily skips more as time goes on. I really don't know what to make of this. The other 7 workers were perfect and testing just fine when I stopped the test, but without an error I'm not sure as to what the problem could be. The temps were about the same as the custom test, 48-55. Also when I stopped this torture test the CPU usage didn't go down to what it normally should be, it was in that 11-15 percent area, and it should be lower. I'm not sure if that's a real concern or not.

Here are my specs:
Intel Core i7 3820 (3.8GHZ, I have not overclocked it.)
MSI Big Bang-XPower II (MS-7737)
G.SKILL Sniper Gaming Series 16GB (4 x 4GB) 240-Pin DDR3 SDRAM DDR3 2133 (PC3 17000) - It's currently at what it was when I put it in 1600Mhz and 11-11-11-28.
Nvidia GeForce GTX 480
Corsair HX1000
Samsung SSD 840 Series 250GB
H100i

I would really appreciate someone's thoughts on what the problem is. I have gone ahead and ordered an ASUS Dx, in hopes that it would fix the sound issues but I am not sure if there is more than meets the eye with the CPU. Sorry if this is in the wrong area as well, I wasn't positive on where I should post this thread.

Thanks!
post #2 of 3
sounds more like a hard drive or ram issue to me.
post #3 of 3
Thread Starter 
I should probably run memtest I suppose, what should I use to test the SSD?
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