HD 7850 Crossfire in BF3 - what can I expect?

MaxentiusDecius · 30 Oct 2012 at 09:03

'Sup guys!

I need answers from cunning people to one simple question; what is the absolute minimum fps I should expect from two Sapphire Radeon HD 7850 2GB @ 1050 mhz in Battlefield 3, ultra settings in 1080p (Let's say 64p Caspian, for example)?

Specs are:
i5 2500k @ stock
Corsair Vengeance 4x4 @ 1600 mhz
OCZ ZT Series 750w
Gigabyte GA-Z77X-UD3H

Thanks!

Gregster · 30 Oct 2012 at 09:32

If both cards scale well in this game (which I don't think they do), you could expect an average of 90+fps

psychodil · 30 Oct 2012 at 09:39

I would think your CPU would determine your minimums on 64-man maps. Try and over clock a little if you can.

As Gregster pointed out, you have plenty if GPU horsepower at that resolution.

tommybhoy · 30 Oct 2012 at 09:50

MaxentiusDecius said:
what is the absolute minimum fps I should expect from two Sapphire Radeon HD 7850 2GB @ 1050 mhz in Battlefield 3, ultra settings in 1080p (Let's say 64p Caspian, for example)?

~55fps.

Based on experience with 2X6950>70@950MHz, but in order to achieve that, you will need to oc your cpu to ~4.5GHz.

Before you jump in, find out how CrossFire works though.

iBSOD · 30 Oct 2012 at 11:34

my 7870/2500k has a minimum of about about 45~ ultra 1080p. That was on singleplayer

oc your i5, and you should get >60fps minimum

MaxentiusDecius · 30 Oct 2012 at 13:39

Wow, so many quick answers! I like it.

OnT: Should I really get minimum 60 (or 55, as one person said)? Because I don't, at full ultra it frequently drops below (sometimes as low as below 50), even (in some maps, Caspian for example) in empty servers and I get rather irritating stutter. I've OC:ed my i5 to 4.5ghz to no avail. I'm running the latest performance drivers by AMD (12.11) with the latest CAP.
I've tried disabling ULPS, uninstalling old drivers with Driver Sweeper and reinstalling, overclocking, underclocking, flipping the cards, reseating the cards, switching motherboard and updating my BIOS. I've also heard that BF3 players have experienced significant performance issues since the latest patch (AK release, I believe). Do my cards underperform or is this normal?

Thanks again!

diamount · 30 Oct 2012 at 13:45

gregster said:
If both cards scale well in this game (which I don't think they do), you could expect an average of 90+fps

This chart was taken in September, but I'm sure it matches nvidia now after the latest drivers.

http://media.bestofmicro.com/U/X/352329/original/MULTI BF3.png

No hotlinking!

Pelinox · 30 Oct 2012 at 13:45

Low FPS happens in BF3, regardless of the cards. People running SLi 680s still dip down to 30-40 fps in certain situations.

weehamish · 30 Oct 2012 at 13:49

diamount said:
This chart was taken in September, but I'm sure it matches nvidia now after the latest drivers.

snip

Is this all at stock clocks?

How much FPS increase on a 7850 from 860 to 1050?

MaxentiusDecius · 30 Oct 2012 at 13:49

Pelinox said:
Low FPS happens in BF3, regardless of the cards. People running SLi 680s still dip down to 30-40 fps in certain situations.

That sounds like an overstatement. Are you sure?

diamount · 30 Oct 2012 at 13:54

weehamish said:
Is this all at stock clocks?

How much FPS increase on a 7850 from 860 to 1050?

The article isn't really clear, all it says is:

Reference Radeon HD 7850
860 MHz GPU, 2 GB GDDR5 at 1200 MHz

All overclocked cards reduced to reference specification for testing

weehamish · 30 Oct 2012 at 13:54

Well it is a console port after all? Or did they port it to the consoles?

Ahh well im sure 1050 should add a good few FPS maybe up to 8?

diamount · 30 Oct 2012 at 14:01

weehamish said:
Well it is a console port after all? Or did they port it to the consoles?

Ahh well im sure 1050 should add a good few FPS maybe up to 8?

Please keep on-topic. A reference 7850 gets around 42 fps at 1080p with 4msaa on, add another and assume it scales. Well do the math.

Uncle Petey · 30 Oct 2012 at 14:02

With the 7950, I see a noticeable difference from 1050 to 1150 so you oughta see significant gains from 860 to 1050.

borley · 30 Oct 2012 at 14:09

There are major drops in BF3 though that i see in no other games.

Rusty0611 · 30 Oct 2012 at 14:11

MaxentiusDecius said:
That sounds like an overstatement. Are you sure?

You're right - they don't.

I don't even dip that low with one 680.

Pelinox · 30 Oct 2012 at 14:37

Rusty0611 said:
You're right - they don't.

I don't even dip that low with one 680.

They do.

There was a long thread about it on another forum(i forgot which), where they tested multiple setups, and in the same situation on Gulf of Oman, the FPS would dip to 30-40s.

But it's only on that and Strike at Karkand where this happens.

Rusty0611 · 30 Oct 2012 at 14:42

Pelinox said:
They do.

There was a long thread about it on another forum(i forgot which), where they tested multiple setups, and in the same situation on Gulf of Oman, the FPS would dip to 30-40s.

But it's only on that and Strike at Karkand where this happens.

Mine drops to 50's on those maps but not 30's and 40's and as I said - that's a single card.

And anyway even if that was true, you should have stated that rather than passing it off as a general rule of thumb.

MaxentiusDecius · 30 Oct 2012 at 15:03

So it means that my drops are normal? I can get a good flow first when lowering the mesh and shadow settings to respectively medium and low. Even then, I can get drops down to 57-58 (Caspian 64p). It might not be a big deal, but I do notice it. I'm very sensitive.

Pelinox · 30 Oct 2012 at 15:29

Rusty0611 said:
Mine drops to 50's on those maps but not 30's and 40's and as I said - that's a single card.

And anyway even if that was true, you should have stated that rather than passing it off as a general rule of thumb.

It's not the maps, it's certain places in the maps.
Sure, its not a thing most people would notice, but it goes to explain that fps drops in Battlefield 3 is a common occurrence.