New i5 4670k CPU Underperforming, is it faulty?

crunxman

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Dec 3, 2013
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10,510
(I was told to ask this here after posting it on reddit. Please help!)

I bought my computer 3-4 months ago, and have since upgraded my GPU which threw my whole world upside down.

I first started noticing this after I replaced my 6950 with a 7990 – during which the new PSU I bought was faulty and fried my mobo and I had to RMA it. After I replaced my mobo everything seemed to be running great with the new GPU, but in some games my CPU was bottlenecking(details on fps below.) I attributed this to my GPU outpacing my CPU so much, as I was used to my 6950 holding back my fps while my CPU was barely trying but comparing with my friend’s comp I feel something is wrong. On more demanding games my CPU is stopping me from getting FPS comparable to what benchmarks for the 7990 are claiming(its maxing out) – and those benchmarks are using an older non OCed CPU.

I’ll use BF4 as my primary example, as I’ve been playing it the most recently and I can compare with my friend who also has it. In BF4 on ultra w/o AA I get a minimum of about 35 fps at absolute worst times, but strangely I get an excess of 130 fps when in less demanding areas. I’ve had to disable windows aero to get it to run that well (with it I was getting 5-10 less fps.) Turning down the graphics to low doesn’t make that much of a difference, and sometimes I get worse fps on low… Now I wouldn’t complain much about the fps I’m getting as they aren’t horrible, but the game also takes AGES to load, sometimes 2 minutes!

I’d just chalk all these issues up to bf4 being a piece of shit, but my cause from concern comes from the fact that my friend who has the exact same computer as me (except a 660ti instead of a 7990) gets HIGHER fps AND 15-20 second load times! Something has to be wrong on my end and I’m not sure what. When I run bf4 all my CPU cores are pegged at 95-100% while my GPU is around 60%. During this my friend says his are at 70-85% max (again, he has the same CPU.)

When I play Crysis 3, I get the same problem: 10-15 lower fps than benchmarks while my CPU is pegged and my GPU is not. It doesn’t make sense to me that my new CPU is bottlenecking me so… why is my CPU running so much worse than my friends?

I’ve got an i5 4670k (not OCed), a 7990 (with SLI on), a 7200 rpm HD, 8g of ram, and I am using 2 monitors (1280 x 1024 and 1080p.) Nothing is overheating, temps are <55c for CPU and <70c for GPU. I’ve tried unparking my cores – didn’t change anything and my friend never did that either yet his still runs better.


I've since tested w/o crossfire enabled in BF4, and got almost the exact same FPS. The only difference was that instead of my CPU maxed and my GPU at about 70%, the usages switched! My CPU was running at about 80% and my GPU ~95, almost the same as what my friend experiences. What gives? How can I test what exactly is causing this?
 
Solution

jnjnilson6

Distinguished

1st - Downclock any component that you might have ever overclocked, back to stock speeds!
2nd - Try using the HD 6950 in the system as it is now!
3rd - If you have no problems what so ever with the 6950, it's either a faulty 7990 or the simple fact that your 4670K doesn't have the guts to keep up with 2 x 7970s. I have a friend with i5-4670K and HD 7990 as well and his system also doesn't perform at 100%.. So that's why I'd say that if somebody has anything even a hair below i7-2600, he should turn his head away from the 7990. I'd say, either buy an i7-4770K or a powerful water cooling and try overclocking the i5-4670K to 4.6 or 4.8 GHz. But yet again, there might still be that slight chance that something is wrong with the GPU.. Check both the clocks of the CPU and GPU while gaming with CPU-Z and GPU-Z. If anything is different than the stock frequencies, restore the clocks at once..
 

crunxman

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Dec 3, 2013
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10,510


1) I don't have anything OCed, so that isn't an issue :(
2) I could try putting the 6950 back in, but seeing as the CPU doesn't peg 100% with crossfire off (and I don't thing it did with the 6950 either) I don't know what that'd accomplish.
3) I don't think its an issue with the GPU, but I'm thinking of running some benchmarks to see what is underperforming. Do you know any good (and free) standard benchmark tests I could run that test CPU/GPU independently?

The strangest thing is how in BF4 my CPU use goes up so much when I have Crossfire on, but my FPS stays the same. I have the latest beta driver so its not that... BF4 aside, I should be getting never be getting 40-50 fps in crysis 3 with sli on. This is so frustrating.
 

jnjnilson6

Distinguished

Well, since you had problems with your motherboard and stuff, it'd be good to know what will happen if you pop your 6950 in the system now.. If it works like before, then, hmm.. For benchmarks: Furmark is especially for the GPU and Cinebench is especially for the CPU, I'd recommend Heaven Benchmark as well.. But 40 - 50 FPS in Crysis 3 seems pretty fine to me.. Most people who say they are playing it maxed out are lying and have their MSAA set to 4 instead of 8. I am getting 30 - 40 FPS with my 2 x 7870, so 50 FPS sounds right for a 7990 which is a bit bottlenecked by the CPU.. Here's a video of my system on Crysis 3: http://www.youtube.com/watch?v=W5hXjnITj4M
 
Solution