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Is my CPU limiting my Graphics Card performance?

Sunnytheseal

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I just bought a Sapphire Nitro R9 380 4 GB as an upgrade for my system.
I'd like to know if my CPU (AMD FX -8120 overclocked to 4.0 GHZ) is hampering the cards performance.


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The bulldozer CPU will hold back most video cards slightly in games compared to an i5/i7/8350, but it depends on the games you're playing and your monitor's resolution. Can you add in that info for us?

Some games don't care too much about CPU performance while others do; also, higher resolutions rely less on CPU power and more on your video card.
 

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I wouldn't think so.

That 380 is a rebranded R9 280 is a rebranded HD7950. GPU is older? than CPU.
 

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I wouldn't think so.

That 380 is a rebranded R9 280 is a rebranded HD7950. GPU is older? than CPU.

R9 380 is a rebranded 285, based on Tonga, not Tahiti Pro. About the same performance as the 280X.

That 8120 is a bummer though. OC to 4GHz makes it better but the thing is still a bottleneck in games where the CPU actually matters.
 

Sunnytheseal

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The bulldozer CPU will hold back most video cards slightly in games compared to an i5/i7/8350, but it depends on the games you're playing and your monitor's resolution. Can you add in that info for us?

Some games don't care too much about CPU performance while others do; also, higher resolutions rely less on CPU power and more on your video card.

I play Diablo 3 and Left for Dead, both at 1920x 1080 at MAX settings.
The reason I ask is because the 3D Mark Benchmarks online for this card are about 1645 points higher that what I receive.
For example, I received a score of 5727 in Fire Strike when I ran the benchmark.
When it was tested online by a website, they got a score of 7372 with the below system specs

  • Intel Core i7-5960X
  • ASUS X99-Deluxe (Intel X99 chipset) motherboard
  • 4 x 4GB Corsair Vengeance LPX DDRR-2133 (Auto timings: CAS 15-15-15-36)
  • Samsung 840 Pro 256GB SSD (OS)
  • Western Digital Caviar Black 1TB (Benchmarks + Games)
  • Windows 7 Ultimate 64-bit SP1
  • Intel INF 10.0.20

8389 Score with these specs on another site

CPU Intel Haswell E 5820k 4.4GHz
Motherboard ASUS X99 Pro
Ram Kingston HyperX Fury 2400MHz (15 – 15 – 15 – 35)
CPU Cooler SilverStone Tundra TD02-E
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Benchmark Scores Faster than yours... I'd bet on it. :)
3DMark Fire Strike has a CPU test. THe more cores and the faster they run, the better. That said, the 5960X is just straight faster than that AMD. THAT is why you are seeing the difference...same with the 5820K. Stop comparing apples to apricots.

Look at the GRAPHICS score.

Or run something like Unigine Heaven/Valley that doesn't respond well to the CPU.
 
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Yup, you will definitely notice a performance loss running an FX-8120 at 1080P, even if it's OC'd at 4GHz. The overclock doesn't help these CPUs much in gaming as the cache and pipelines (IIRC, it's been forever since BD) hamstring it.

Fortunately L4D and Diablo 3 aren't too needy when it comes to CPU performance. Either way, I would expect around a 25% loss compared to an i5/i7 and a 15% loss compared to an FX-8350 at the same clock speeds.



Chart says it all. These are running at lower resolutions so the difference isn't quite this dramatic, but it is pretty close. Again, at 1080P, I'd estimate a 25% performance drop on average over an i5.
 
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Benchmark Scores Faster than yours... I'd bet on it. :)
Those results are a bit inflated due to the even lower than 1080p resolution.... 1024x768 is nearly ALL CPU.
 
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Another graph comparing the FX-8150 to an older i5-2500K:



More products can be compared at http://www.anandtech.com/bench/product/434?vs=288

Those results are a bit inflated due to the even lower than 1080p resolution.... 1024x768 is nearly ALL CPU.

I agree, but unfortunately there aren't any better reviews I can find due to all major review sites throwing their Bulldozer CPUs in the trash after the FX-83xx CPUs were released. We can see even in the FX-83xx CPUs though that WITH the architecture improvements they still take a noticeable performance hit. They were released three years ago now after all... but DX12 may change this.

Some more searching found this article here from TPU comparing 8150 to 8350.
 
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All that graph tells me is the FX is capable of pushing over 60fps in most games when the settings are set to use the CPU as much as possible.

While the chart is fair as a comparison for overall performance it isn't fair for gaming performance since most games at 1080p actually use 60fps v-synch. And only a couple of titles failed to hit that.

Is the FX limiting the GPU -no.
Is the FX a limiting factor for the whole system when DX11 and lower environments are used - yes.
Is the FX future proof and will it mature to be faster - this is actually a golden question since DX12 might deal with CPU threading better.
 
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AMD in general will take about a 5% hit on GPU performance over Intel. But to answer your question. No you will be fine
 
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Benchmark Scores Faster than yours... I'd bet on it. :)
I agree, but unfortunately there aren't any better reviews I can find due to all major review sites throwing their Bulldozer CPUs in the trash after the FX-83xx CPUs were released. We can see even in the FX-83xx CPUs though that WITH the architecture improvements they still take a noticeable performance hit. They were released three years ago now after all... but DX12 may change this.

Some more searching found this article here from TPU comparing 8150 to 8350.
Weird how at 1920x1080 that gap shrinks... same with not playing a RTS or MMO which are notoriously CPU heavy. ;)

"It depends" is a really good answer here.
 
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Truly depends on the game/situation imo... But yes it will hold the GPU back somewhat.

For example.... My 8350 will run BF4 with everything turned to the max at a solid 59 FPS

However, GTA 5 basically runs at 35-55 FPS with my FX 8350/GTX 970 with everything on High/Max relatively speaking.... there are some in depth graphics options in this game however.

ESO/Guild Wars 2 also do not perform well.

Even though its not a direct comparison by any means (FX 8350 vs 8120) and (GTX 970 vs R9 380) I can still say for sure that it held my 970 back in certain situations @ 1080p.

Using an i5 now I basically get a solid 59FPS in GTA5 overall it has not gone below 50FPS, also much better performance in ESO Online and Guild Wars 2, and 200-300 points higher in Valley/Heaven benchmarks
 
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Point is, an Intel would be better but the FX is enough.
 
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Thing is, try to find a cheap, used 8350 on eBay or a brand new cheap one and be done with it. The FX architecture are only good for single, mid-range gpus. I use to run an 8350 with 280x/7970ghz and it was fine on bf4. I bought a second 280x and it made things worse. Same goes for GTAV, its smooth with one 280x but two would make my frames on avg 35fps. Upgraded to 4790k and frames more than doubled in both games. So Jborg's 970 will get hampered by the 8350. In my opinion the fastest card the FX architectures can hold are the 960/280x/380. Anything higher would be a CPU bottleneck.

My tip, get the 8350 and don't upgrade your gpu. If you do, might as well go Intel.

P.S. Your 380 is the same as the 285.

 

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an i7 could show up faster in some titles, but on average no - i'd say it'll do the job quite well.

If you need higher performance in a game, simply lower the CPU related settings not the GPU ones.
 
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Yup, you will definitely notice a performance loss running an FX-8120 at 1080P, even if it's OC'd at 4GHz. The overclock doesn't help these CPUs much in gaming as the cache and pipelines (IIRC, it's been forever since BD) hamstring it.

Fortunately L4D and Diablo 3 aren't too needy when it comes to CPU performance. Either way, I would expect around a 25% loss compared to an i5/i7 and a 15% loss compared to an FX-8350 at the same clock speeds.



Chart says it all. These are running at lower resolutions so the difference isn't quite this dramatic, but it is pretty close. Again, at 1080P, I'd estimate a 25% performance drop on average over an i5.
It's not low resolution or CPU power handicapping BD here, it's the game engine which is. They are all single threaded DX9 games and both Starcraft and WoW use x87 instruction which is optimized for Intel.
I say optimized because x87 is so ancient that AMD dropped support with Bulldozer.
It's what Gamebryo uses as well. Gamebryo is around 15 years old...

Single threaded performance sux on Bulldozer, PD is only around 15% faster so if you just play Diablo Intel is the way to go..
In a properly threaded new DX11 games an 8320 will beat an 3570 at same res, but with DX11 titles being so GPU heavy now it doesn't really matter either way.

AMD doesn't do so well in DX11 crossfire tho ....who knows if that will change...... Like the guy above said...it depends on the game.

3DMark Fire Strike has a CPU test. THe more cores and the faster they run, the better. That said, the 5960X is just straight faster than that AMD. THAT is why you are seeing the difference...same with the 5820K. Stop comparing apples to apricots.

Look at the GRAPHICS score.

Or run something like Unigine Heaven/Valley that doesn't respond well to the CPU.
Hehe I just noticed that......yep def apples to carrots. :)
 
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Sunnytheseal

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Thanks everyone for the replies.
I'll be getting a brand new system hopefully by year end, when my lawsuit settles :)
 
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short answer; yes.

long answer; i doubt it is by that much that you would notice when the gpu is the limiting factor in 9 out of 10 games.

the truth is a faster cpu will always get more out of the same gpu. best of all there is always a new cpu out tomorrow, or the week after xD
 
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Guys, guys guys.... linking benchmarks from anandtech that just pit an i5 versus the FX 8120 is simply being dishonest and misleading.

His bottleneck is primarily his GPU, and NOT his CPU. Right now you get the OP thinking he earns about 25% performance by upgrading CPU, but that is total nonsense on a mid-ranged GPU. If he takes the i5, his GPU is the bottleneck, and that is no different from right now with the FX in 90% of all games.

FX 8120 with modest overclock and an R9 285 is just quite simply... well balanced. Avoiding all bottlenecks doesn't exist - no matter how fast your components are - there is ALWAYS some bottleneck, and it is called maximum performance of the system. Seek balance, don't bother about the few percent you gain or lose if the difference is lower than 10%. Which in this case, it is.
 
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I just bought a Sapphire Nitro R9 380 4 GB as an upgrade for my system.
I'd like to know if my CPU (AMD FX -8120 overclocked to 4.0 GHZ) is hampering the cards performance.


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In short, no you are not getting much of a bottleneck with that card. You would probably be in the less than 5% range of difference if you swapped to an i5 or similar with that GPU so I would not worry.
 
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Guys, guys guys.... linking benchmarks from anandtech that just pit an i5 versus the FX 8120 is simply being dishonest and misleading.

His bottleneck is primarily his GPU, and NOT his CPU. Right now you get the OP thinking he earns about 25% performance by upgrading CPU, but that is total nonsense on a mid-ranged GPU. If he takes the i5, his GPU is the bottleneck, and that is no different from right now with the FX in 90% of all games.

FX 8120 with modest overclock and an R9 285 is just quite simply... well balanced. Avoiding all bottlenecks doesn't exist - no matter how fast your components are - there is ALWAYS some bottleneck, and it is called maximum performance of the system. Seek balance, don't bother about the few percent you gain or lose if the difference is lower than 10%. Which in this case, it is.
Well in a game like Starcraft, Diablo, or Wow his 8120 is a boat anchor,... You could quadfire and it wouldn't help.

I spent about 160hrs in Fallout New Vegas using a 6950, then 7950 and a 4.8Ghz 8320. u might laugh but my average frame rate was 45fps.
1 core was constantly pegged @99% while the other 7 sat idle.... :p The GPU load never got over 35%.
Same deal in Skyrim.... and Fallout 4 will be too, sadly. Only cause they run ancient engines.... New games are great. Even GTA V isn't too bad.

When I first bought my FX I was upgrading from a 955 X4,
I oc'd to 5GHz then ran GTA IV, just to see what would happen..... lol 50fps about 5fps faster. :p
 
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Well in a game like Starcraft, Diablo, or Wow his 8120 is a boat anchor,... You could quadfire and it wouldn't help.

I spent about 160hrs in Fallout New Vegas using a 6950, then 7950 and a 4.8Ghz 8320. u might laugh but my average frame rate was 45fps.
1 core was constantly pegged @99% while the other 7 sat idle.... :p The GPU load never got over 35%.
Same deal in Skyrim.... and Fallout 4 will be too, sadly. Only cause they run ancient engines.... New games are great. Even GTA V isn't too bad.

When I first bought my FX I was upgrading from a 955 X4,
I oc'd to 5GHz then ran GTA IV, just to see what would happen..... lol 50fps about 5fps faster. :p

as someone who plays a lot of starcraft II and lately fallout 3/NV, you're completely correct - THOSE old titles only care about single threaded CPU performance. i can play them at 3200x1800 (using VRS) with AA and still have enough GPU power, its CPU limitations that get me. Part of the reason i went from a phenom II x6 to an i5 was for those titles (and later the i7 because it was cheap second hand)
 
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