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I'm still very confused with my Crossfire setup which isnt being bottlenecked

TonyTurbo78

TonyTurbo78

TonyTurbo78

Soldato
Joined
26 Sep 2013
Posts
10,758
Location
West End, Southampton
Hi guys.

I know I've been a little quiet this past week, mainly because I've been enjoying some GTA V online and also playing Crysis 3 and a few others on PC.

Now, I'm really confused with whats going on, or shall we say whats not going on regarding my crossfire performance. Now, don't get me wrong, performance is insanely good, no stutters or crazy frame drops. Every game I'm maxing out now and holding 60fps+ apart from maybe Crysis 3.

The thing I don't understand is, when I take off Vsync and let the frames fly, both my GPUs only work at 40% to 60% each while all my cores on my I5 are nowhere near 100%. Even in Crysis 3 which is the most taxing games im running, they generally average around 80% yet my GPU usage is again only around 60% on each card. Why does this happen? If my CPU cores are not at 100%, why can't each of my GPUs run more than they are?? Why cant I see more frames if there is so much more CPU power to be used?

Examples to follow.

This is Saints Row 4 @1080 4xMSAA and 16xAF everything set as high as possible

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Just because your CPU isn't at 100% doesn't mean its not maxed out.

If a game maxes out the floating point units of your CPU but the integer or other units are relatively untouched then then said game is CPU limited but as its not maxing out all the units inside the CPU it won't show as being 100% utilised.

If that makes sense?
 
ah ok yes that makes sense. People always talk about if CPU usage is at 100%, then there is your CPU bottleneck. The only game to date I've seen that happen on has been BF4 beta.

I have a I7 3770K in my basket....a wise buy??
 
TonyTurbo78 said:
ah ok yes that makes sense. People always talk about if CPU usage is at 100%, then there is your CPU bottleneck. The only game to date I've seen that happen on has been BF4 beta.

I have a I7 3770K in my basket....a wise buy??
Click to expand...

Not if you've got an i5 3570k. You'll see practically no difference between the two when gaming.
 
I just bought an i7 3770k to replace my 2500k for my sli 670's. The i5 just didn't cut the mustard in some games and is bottlenecking my GPU.
 
Jono8 said:
I just bought an i7 3770k to replace my 2500k for my sli 670's. The i5 just didn't cut the mustard in some games and is bottlenecking my GPU.
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How did youget on with that jono8??

I've just done the exact same thing, from i5 2500k to a i7 3770k and have to say quite a difference in BF3 though at first i kind of did not see it but now i do.
Game feels so much smoother with a lot less lag/spiking and every single thing is on ultra and still plays like all the settings are on medium if you see what i mean :)
 
In games like BF3/BF4 getting the 3770k will feed them enough CPU juice to get them to the high 90% usage i would have thought, the only other way to get them working harder is up increasing the resolution if you've run out of settings to turn up to 11.

SR4 isn't that graphically demanding, so getting low usage sounds about right :D
 
ashmanuk67 said:
How did youget on with that jono8??

I've just done the exact same thing, ftomorrow i5 2500k to a i7 3770k and have to say quite a difference in BF3 though at first i kind of did not see it but now i do.
Game feels so much smoother with a lot less lag/spiking and every single thing is on ultra and still plays like all the settings are on medium if you see what i mean :)
Click to expand...

Took a while to get the motherboard flash right but finally did it this evening . Going to install it tomorrow when I get home from work. Will report in once ive tested it .
 
Tonester0011 said:
In games like BF3/BF4 getting the 3770k will feed them enough CPU juice to get them to the high 90% usage i would have thought, the only other way to get them working harder is up increasing the resolution if you've run out of settings to turn up to 11.

SR4 isn't that graphically demanding, so getting low usage sounds about right :D
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Hi Tone

Yep realise SR4 looks like crap, but I thought with so much left on my cores and so much left on my GPU usage, they will be used as much as possible until fps literally can not go any higher. Was just a bit baffled why I'm hovering around 100fps when I have only 50% usage on CPU and GPU, why cant they run at 100% and give me 200fps lol
 
SR4 isn't the best game to test this I feel. Try something with a decent engine like bf3 or crysis 3. That is where my true bottleneck shows up.
 
Jono8 said:
SR4 isn't the best game to test this I feel. Try something with a decent engine like bf3 or crysis 3. That is where my true bottleneck shows up.
Click to expand...

Here is Crysis 3 totally maxed out...now they being run hard lmao. I just didn't quite understand why SR4 wasn't able to give me 200fps as I had so much juice left In my GPUs and CPU

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Different games have different needs.
Read a bit about which settings are intensive on your cpu, ram and gpu.
I am sure it will explain a lot.
 
LtMatt said:
Cpu bottleneck, well clocked i7 time. Especially at low res ala 1080p. :)
Click to expand...

Better make that a 5Ghz+ i7

I just ran the Crysis 1 benchmark with my 2600k at 4.7Ghz with Crossfire 7950's and both cards were between 50-60% use at 1080p

Even turning on 4xMSAA+4xTrSSAA only moved them to 70-80%!!

Can't wait to move to 1440p so I can get more use out of my cards
 
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