faulty i7 4790?

mjcw · Mar 5, 2015

Hello everyone. I'm experiencing very performance on my brand new pc and I can't work out why.I built the following:
Gigabyte z97x gaming 7
Intel i7 4790
Gainward phantom gtx 979
16 gb ram ddr3
Corsair gold 750 psu
Kingston fury 240 ssd
All in a corsair 300r

After I set it all I experienced truly dismal performance in everything from league ofnlegends where I got >30 fps to battlefield four which just crashed the system. Sent the gpu to msy servicing and put my old gt 640 in. Experiencing similar problems to a lesser degree. Performance Test for the CPU scores were 1200 with the 970, 2400 with the 640 yesterday and 900 today with the 640, which leads me to think the gpu might be fine and the CPU faulty. It doesn't run hot though, just performs dismally. I am legitimately baffled, and help appreciated

I3lue1 · Mar 5, 2015

It's funny that you're using some pompous English words but generally your phrasing seems wrong.

I'd say it might be your: motherboard/ PSU/ virus. Usually a faulty component will produce serious errors: blue screen/ system freeze/ etc. What you're describing sounds more like a virus/ lack of enough power/ bottlenecked system (usually by a motherboard).

Whateverworks_19 · Mar 5, 2015

mjcw :

First of all. I understand every single word you use, but I fail to find the coherence, as Mr. @I3lue1 mentioned as well.

What I get out of your post, however, is that when playing less-demanding games, like league of legends, you experience a drop in performance. When playing demanding games like BF4, you experience a drop in performance and subsequently a complete shutdown.

Now, given the above assessment of your problem, I find Mr. @I3lue1 answer the best we can get at the moment.
I find it very unlikely your CPU is faulty, though in some cases it can very rarely happen.

I find bottleneck very improbable. Software problems could indeed be the case, clean up and scan your computer by trusted software, and see if it improves performance.

The problem could also be the power-supply, though again I find it unlikely given we don't have much information, too draw a conclusion from. A reaction from the system resulting in a complete shutdown is in most cases due to one of two reasons:

1) Overheating. PC shuts down to prevent damage to hardware, due to excessive waste-heat.

2) Faulty PSU. The PSU fails to deliver enough effect when under load (i.e when playing games) forcing a drop in performance and ultimately a shutdown.

blockhead78 · Mar 5, 2015

have you overclocked the cpu?

if so, set it back to stock and see if the problem goes away

regardless if you've overclocked or not, run a stress test at stock settings (Intel XTU, aidia64 or prime95). See if you get any crashing and check the temps as well

If you get any crashing or high temps when stress testing at stock, would probably be best to start with re-mounting the cpu and cooler with a new application of TIM

mjcw · Mar 5, 2015

Gentlemen, thanks for your input. I didn't realise a bit of drunken English would cause so many problems among you. I'll remember to be on my best in the future.
The system is literally three days old and has barely had time to browse the internet which would lead me to assume that it's not a software issue. I'll run a test regardless and see what comes back, but I don't think that would be it.
In terms of bottlenecking, I'm not sure how the motherboard could bottleneck this particular CPU. I'm certainly willing to learn though.

I don't have a spare PSU to test the theory but I appreciate everyone's input.

@blockhead78 I haven't. Everything in the PC is currently stock. The temperatures under stress are about 60-65 with idle temps being about 35-40, which only adds to my frustration as theyre clearly not over heating.

I3lue1 · Mar 6, 2015

It's not that you caused trouble; it was just a friendly suggestion for improvement. Given the fact that it's just drunken English, you're off the hook

.

Back on track: I only saw system shutdowns while under load when I installed a new video card and each time I'd play Crysis 3 I'd get a system reset after ~30 mins of gameplay. After fiddling with both the hardware and software area I concluded that my 550W PSU was just too weak for my system. I upgraded to a mid-tier 650W PSU and the resets were gone. Amazingly I also saw a 5-10 temperature drop in my GPU's temps (probably my old PSU was really strained by the system and was sending fluctuating power to my GPU, which resulted in extra heat).

I have a AMD FX 8350 and had to change 4 motherboards before I could find one that wouldn't bottleneck my system.

Due to these two reasons I suspect bottlenecking or weak PSU.

TakeshiKudo · Mar 6, 2015

Could it be you didn't update the GPU driver?

Whateverworks_19 · Mar 6, 2015

mjcw :

No problem at all, Sir. I simply had a laugh and thought about a cheeky reply - no disrespect nor linguistical superiority meant from my side, just a bit of banter. Perhaps I suck at it, that sounds plausibly probable.

Thus far, I would say that the most likely culprit is the PSU. I experienced similar problems on my old i7-950 with a very, very old GTX650 768mb (lol) and after I changed my PSU, things got awfully better.

See if it is possible to try one of three things, exclusively regarding PSU:

1) Borrow a PSU from a friend or a PC store, it is possible that a store will borrow you a PSU for a day for free.
2) Perform the paperclip test (It will more than likely pass the test, however if it does not it is dead)

3) If you own a digital multimeter (DMM) you can test your PSU in great depth and find out precisely if it is that component causing the troubles.

Hope it gives some ideas.

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