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

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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  1. 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
  2. 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).
  3. 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.
  4. 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-app-profiles.aspx
    I installed and rebooted, my problem was resolved im sitting at 80-95% GPU usage on both cards.
  5. 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%.
  6. 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.
  7. I'll offer some food for thought read this review and make your own choice. Be mindful that in BF4 if you choose to play the game will utilize HT how efficient will HT work, nobody knows.

    http://chipreviews.com/main-feature/main-news/battlefield-3-revisited/
  8. 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? :)
  9. 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.
  10. 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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