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Battlefield 3 Multi Player - i5 & 2 x 7970 CrossFire - CPU Bottleneck, Low GPU Usage on MP? Would an i7 help Much? Benchmarks?

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October 21, 2013 5:10:16 AM

I have recently upgraded to CrossFire and noticed that the GPU usage is about 40% at best on each card (some times it spikes up a bit). I am running BF3 on minimum rtrying to get a steady / constant 100fps (120 would be nicer!).

So it looks like the CPU is bottle-necking on large maps or when there are a lot of players, say more than 16 per side. My CPU is sat at like 90+ spikes to 100 and I'm getting about 70 / 80 /90 with max at like 150+ fps when the CPU is not being hammered (pretty poor for 2 x 7970s that are sat hardly being used!).

Would a 3.5Ghz i7 3570k help much is I clocked it to say... 4.6Ghz? I've heard that BF3 MP likes threads / HT and uses more cores... But id love to hear from some one who has gone from i5 to i7 on dual cards (when it was causing a bottleneck like this). Or any benchmarks that exist (I can't find any...).

My current machine spec: i5 3570k @ 4.6Ghz 2 x 7970 CrossFire @ 1200 Core & 1600 Memory (both cards).

Thanks in advance!
@Arr0way

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October 21, 2013 5:15:59 AM

Im kind of going through the same problem.. GPU is fine but my processor runs at 100% while playing the game.. grant it its only a dual core still.. the game is NOT graphic intensive or a huge game like BF3 or COD (its a rip off FREE online version of COD/BATTLEFIELD called Soldier Front 2) so its not even a modern FPS.. I JUST bought this new comp bcuz it was listed as gaming computer and I havent been able to play my game w.o constant chopping from 100% cpu usage.. check my last thread I posted.. its similar to this and some answers there (when they come) might help you as well if you dont find much help on this thread


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October 22, 2013 12:48:51 AM

Same thing over here, but using CF of 280X. CPU is very often on 90-99% levels and GPU usage same time is going low. Switching to i7 3770k should be a good answer I guess (yet there are many people saying that it's simply not possible to bottleneck 3570k with CF setup).
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October 22, 2013 12:54:33 AM

in a honest opinion i always prefer a i7. ther a reason why it exist & hence to those who say its a pure waste would never understand that a i7 has never failed to bottlneck in any situation. i currently own 2 i7 1 is 17-870 & other is 3770 & im proud to say they have never bottlnecked me whatsoever. that is to say bf3 multiplayer is cpu instensive game whereas the singleplayer is more gpu intensive imho.
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October 22, 2013 7:39:45 PM

Arr0way said:
I have recently upgraded to CrossFire and noticed that the GPU usage is about 40% at best on each card (some times it spikes up a bit). I am running BF3 on minimum rtrying to get a steady / constant 100fps (120 would be nicer!).

So it looks like the CPU is bottle-necking on large maps or when there are a lot of players, say more than 16 per side. My CPU is sat at like 90+ spikes to 100 and I'm getting about 70 / 80 /90 with max at like 150+ fps when the CPU is not being hammered (pretty poor for 2 x 7970s that are sat hardly being used!).

Would a 3.5Ghz i7 3570k help much is I clocked it to say... 4.6Ghz? I've heard that BF3 MP likes threads / HT and uses more cores... But id love to hear from some one who has gone from i5 to i7 on dual cards (when it was causing a bottleneck like this). Or any benchmarks that exist (I can't find any...).

My current machine spec: i5 3570k @ 4.6Ghz 2 x 7970 CrossFire @ 1200 Core & 1600 Memory (both cards).

Thanks in advance!
@Arr0way



Try this I was having low GPU usage on my 2x7870 XT both cards around 40-55%

I went to http://sites.amd.com/us/game/downloads/Pages/crossfirex...
I installed and rebooted, my problem was resolved im sitting at 80-95% GPU usage on both cards.
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October 23, 2013 10:01:57 AM

Just upgraded to 3770k. Usage of CPU in BF3 is not max 50-60% so yeah, HT helps a lot.
Still no sure about performance of Crossfire setup. The usage spikes between 70-95%.
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October 23, 2013 4:01:45 PM

b3ka said:
Just upgraded to 3770k. Usage of CPU in BF3 is not max 50-60% so yeah, HT helps a lot.
Still no sure about performance of Crossfire setup. The usage spikes between 70-95%.


I agree I am currently still using my i7 920 at 4Ghz with HT I'm at 60-70%, and with HT off I sit at about 85-95% and my frame rate seems to drop by 5-10 frames on average.

I would say if you can OC to 4.5 Ghz you would see a pretty good performance gain.
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October 28, 2013 12:15:15 AM

FX-6300 @ 4.62Ghz Only uses about 70% CPU, CrossfireX 7850 around 50% load on each card, average 90 FPS on 64 slot server on ULTRA MAX everything. 1920x1080

I thought intel chips were better? :) 
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October 28, 2013 12:31:01 AM

Well first of all, one 7990 or R9 290x would perform a lot better.

But yes, an i7 would help you. HT helps more than people want to admit. The extra L3 cache the i7 has will help too.

I do find it a little hard to believe that an overclocked i5 would bottleneck two 7970s though, but you are asking for a lot.
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November 13, 2013 6:31:53 AM

Ok for a start, 1 x 290x does not out perform x 2 7970s in crossfire on this game - we tested it.

The i7 helped loads, a lot more than I expected it would in BF3 / BF4 multiplayer.

It also increased performance in other games, tomb raider benchmark etc.

Just thought I would report back, in case anyone else needs this info.
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