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Crossfire :(

chief barker said:
I understand what you are saying, for some reason the Gulf of Oman map runs like a dog on my system too, I never play that map because of this.

Try lowering the clocks on your 7950s just to see if you get a higher GPU usage, if you do then you are CPU bottlenecked like me.

Because of my bottleneck I run my cards at 850/1375 and get higher usage from them but the same framerate.
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Think you might be onto something here dropped down to 800/1375 and jumped onto a none B2K map and game seems much better.
 
Shanks, could you have a play about with the clocks and see at which point the bottleneck drops off? May be helpful for others on dual cards and 4 thread chips :)
 
NoobCannon said:
Just been thru all this. Its your cpu, i bet its bouncing around 100% usage and causing microstutter

http://forums.overclockers.co.uk/showthread.php?t=18521314

Upgraded from an i5 @ 4.7ghz to an i7 at the same clocks, microstutter gone and cpu usage around 60%. Bf3 loves threads!

Steve
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Yes it loves threads, but it also loves a highly clocked CPU too.

My i7 920 @ 4.1 (HT on) just doesn't cut the mustard. And i'm only seeing 65-70% CPU usage across all 8 threads.
 
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i7 2600k or 2700k

Witch one guys? I can defo confirm an i5 2500k is bottle necking two 7950's :eek:

I have had to drop them both down to 800/1250 for even tomb raider.
 
Either or tbh, iirc the 2700 has a slightly higher stock boost but essentially the same chip so it's not going to matter once it's clocked :)
 
Should manage an easy 4.8ghz with a h80 on it too, still pains me that I sold my 2600k, best chip I've ever owned.
 
This link is quite informative for how Frostbite 2 utilises threads: http://chipreviews.com/main-feature...-limit-6-core-performance-in-battlefield-3/3/

Just two extra physical cores (hex) generates average frame rates some 20fps higher then a quad even with HT on. In some cases 6 physical vs 4 physical, 4 HT, the 6 core was a clear winner.

This is why I think AMD's 8 core line up will fair rather well on FB3, physical cores acting as a make weight for poor ipc.
 
pgi947 said:
This link is quite informative for how Frostbite 2 utilises threads: http://chipreviews.com/main-feature...-limit-6-core-performance-in-battlefield-3/3/

Just two extra physical cores (hex) generates average frame rates some 20fps higher then a quad even with HT on. In some cases 6 physical vs 4 physical, 4 HT, the 6 core was a clear winner.

This is why I think AMD's 8 core line up will fair rather well on FB3, physical cores acting as a make weight for poor ipc.
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:) this is why I am waiting for BF4 before I sort out some X-fire settings etc.
 
evohicks said:
:) this is why I am waiting for BF4 before I sort out some X-fire settings etc.
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Could you do me a favour and quickly fire up BF3 and monitor both CPU and GPU usages with dual cards? Just interested to see how those 8 core AMD's fair up just now :)
 
pgi947 said:
Could you do me a favour and quickly fire up BF3 and monitor both CPU and GPU usages with dual cards? Just interested to see how those 8 core AMD's fair up just now :)
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Horribly to be honest. Last 10 mins on ziba tower 51/53 % max usage. Tried some settings from this thread but its never been good. P cars is around 80% usage atm. Didn't check CPU, can that be done in AB?
Also all stock clocks.
 
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Just have something like open hwmon running, it should log what max usage per core was. Or if on win8, task manager has an option to show core usage in separate graphs.

That is poor, if the same applies to bf4 then amd really made a pointless showing at e3 by pairing up 8 core amd chips with a 7990 for their tech demos.
 
pgi947 said:
Just have something like open hwmon running, it should log what max usage per core was. Or if on win8, task manager has an option to show core usage in separate graphs.

That is poor, if the same applies to bf4 then amd really made a pointless showing at e3 by pairing up 8 core amd chips with a 7990 for their tech demos.
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I am led to believe that they were also using the 8350 with dual 7970's at the BF4 stand at E3 according to one of my twitter feeds, I would like to know their settings etc..
Edit, I have these cards running both near 100% in benchmarks, I know its a BF3 issue but I'm still glad I got the 2 cards, an opportunity came and I have always wanted to try x-fire, I am confident some drivers will come along(as promised) to optimize the cards performance but I'm not getting excited just yet, who knows, but 50% usage on both cards obviously leads to the question in most peoples mind, why bother with X-fire!
 
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chief barker said:
Yes it loves threads, but it also loves a highly clocked CPU too.

My i7 920 @ 4.1 (HT on) just doesn't cut the mustard. And i'm only seeing 65-70% CPU usage across all 8 threads.
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What cards chief? If amd 700/nv 600 or above, it's probably down to the cpu. I tried my 670's in my 930 at 4ghz. Card usage was similair to what youve stated. In the spec in sig theyre maxing at 97% use with the cpu at 4.5ghz. Unfortunately this chip isnt stable at that speed as it's an incredibly volt hungry poor clocker, 1.3200 vcore in bios, it passes ibt standard on 10 runs with quite high temps, but still produces a lot of whea errors and program crashes/freezes.
 
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