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Will FX-8120 bottleneck HD 6850 Crossfire?

Last response: in Graphics & Displays
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July 5, 2012 6:13:16 AM

Ok I am a bit nervous because I am thinking about getting 6850 crossfire but People keep saying that my 8120 will completely bottleneck the gpu by 30%-50%

I am making this thread to hopfully get an answer from someone who is not just going to say the 2500k is soooo much better... if you can please give me a ligit answer that will help me.

I just built this computer 1 week ago and im hoping I can crossfire without having to take it apart and rebuid it... I personally don't understand how a 8 core 3.1 ghz cpu can atcually bottlneck a 6850 crossfire.

Thank you for you time!
a b U Graphics card
July 5, 2012 6:28:47 AM

Your bottleneck would be more like a 10-20%. But here's the thing... Are you going for asthetics and looks for crossfire. Or you want the performance? cause a GTX 670 or a 7970 would be about the same price as getting two 6850's.
Unless you have one 6850 already then fine go ahead and buy another
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July 5, 2012 6:31:51 AM

its about performance and are you sure that I would get a bottleneck... the 8120 is a powerful card
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a b U Graphics card
July 5, 2012 6:38:40 AM

Like i said, 10-20% if any. And you won't really notice it. One thing you will learn after a while is. no matter what your system is going to have bottlenecks, over time hardware looses performance by 2-3% creating a unbalance thus needing a boost or revamp in system hardware... So its always best to leave headroom in your system unless you just naturally have the best rig out there
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a c 218 U Graphics card
July 5, 2012 3:30:39 PM

The FX-8120 will absoultely NOT bottleneck a HD6850. Nope. Won't happen. Period.

Now, comparing the F-8120 to the capability of the i5-2500k is a a different matter. In this comparison, the i5 is the stronger of the 2 in terms of bandwidth throughput/processing/capability.

Even CFed 6850s will not be a problem for the FX-8120.

Good luck and have fun!
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July 5, 2012 3:31:37 PM

Only a small bottleneck.
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a c 218 U Graphics card
July 5, 2012 3:40:08 PM

Nope. Won't happen. The issue is comparing the right components and then looking at the results. The OPs original question is really a comparison between the FX-8120 and the i5-2500k (the i5 is stronger), not so much a question about the HD6850.

The HD6850 is a good, solid mid-tier GPU and won't even come close to overwhelming any AM3+ mobo/chipset/CPU. Neither in a single or CF config.

Make sense now?
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July 5, 2012 4:20:37 PM

I agree with COLGeek it may not be as good performance wise(but it was 60 dollars less) but the 8120 is a pretty damn powerfull card... again im not saying it beats all the intel cards but I also think that it's a newer card and has a big kick... Personally i think that the 8120 and 6850 CFed won't bottleneck. I think that psychosaysdie is just being a intel fanboy.
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a b U Graphics card
July 5, 2012 4:36:42 PM

COLGeek said:
Nope. Won't happen. The issue is comparing the right components and then looking at the results. The OPs original question is really a comparison between the FX-8120 and the i5-2500k (the i5 is stronger), not so much a question about the HD6850.

The HD6850 is a good, solid mid-tier GPU and won't even come close to overwhelming any AM3+ mobo/chipset/CPU. Neither in a single or CF config.

Make sense now?


I just saw this thread

yikes nice save
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July 5, 2012 4:39:04 PM

awesome but do you think it wont bottleneck even though it wont be oc to 4.5?
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a c 218 U Graphics card
July 5, 2012 4:40:28 PM

Even at stock there will be no bottleneck with a FX-8120 and HD6850.
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a b U Graphics card
July 5, 2012 4:47:21 PM

if you actually saw the review i posted, the fx 8120 when overclocked, performs the same in gaming and sometimes better than the i5 2500k
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July 5, 2012 4:47:41 PM

ok well that solves my problem then... now if a intel person can please explain to me why everyone HATES the fx series?
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a c 218 U Graphics card
July 5, 2012 4:55:26 PM

PanicMaster85 said:
ok well that solves my problem then... now if a intel person can please explain to me why everyone HATES the fx series?

There are probably a bazillion (that is a lot) threads on Tom's Forums that bash the FX series in some fashion. Essentially, the FX CPUs (I have one ) did not live up to the hype that was lauded onto them before they were released. They are very good CPUs, but in terms of raw perforamce, Intel is leading the pack.

Your question is the type that often triggers the AMD vs. Intel "holy wars". Be careful of "flames" here.

Good luck!
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July 5, 2012 5:26:41 PM

haha yeah I understand AMD is better for budget building but Intel has better performace (for twice the price :p )
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a b U Graphics card
July 5, 2012 6:00:50 PM

PanicMaster85 said:
haha yeah I understand AMD is better for budget building but Intel has better performace (for twice the price :p )


thats a good way to put it, if you have the budget to go with intel, go ahead, but if not AMD is a good option too, they stopped being competitive with intel with the phenom II series, the six core cpus put a good fight to the I7 900 series, except for the extreme version of course
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July 5, 2012 6:23:18 PM

yeah exatcly the intel has better quality-by this i meant that there cpus are completely reliable and will last a long time against games so yes intel beats amd but Intel is also much older than AMD... but i bought a cpu that is off and on in the battle against the 2500K and was about 60 dollars less and I mean from what I see all im going to use it one maby two monitors because I dont have the budget to get more than that really. And i see videos where people are getting 60-70 fps on crysis and bf3. once I start getting a income I will probably move up to Intels faster cpu's. But I have to give AMD some credit for having decent CPU's that cost half as much as a intel cpu.

Personally I think that AMD has a better Price vs performace(value) but im no expert :) 
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a b U Graphics card
July 5, 2012 6:39:44 PM

minimal bottleneck but just wait for the microstuttering to cause you to rip all your hair out,

fx cores are weak, period, the the 2-4 cores that you do utilize (outside a couple games) will likely not have enough overhead to run to gpus properly, just my opinion but for dual card configs Id look towards at least an i5, again just my opinion but I am someone who came from the AMD camp trying to do basically the same as the OP is doing now and was very pissed for wasting time/ money in the end so learn from my mistakes

happened to me with a highly oc'ed 955be and 6870 x fire....

personally Id sell the 6850 and get a more powerful single card

I know many games are using 4+ cores now but bottom line is that the cores that the 8120 does have are weak, weaker then deneb which I found to be insufficient to run 6870 xfire in my own experience
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July 5, 2012 6:51:58 PM

Ok that makes sense and ill think about it but I usually oc my cpu to 3.8ghz not even trying... so do you still think ill get a *** load of microstuddering?
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a b U Graphics card
July 5, 2012 6:55:29 PM

had my 955be @4.2ghz and it was horrible, terrible waste of time/money although with my current dual card config I have 0 microstuttering
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July 5, 2012 7:09:34 PM

Your better off getting a single gpu for your build. Your bottleneck will be there but like others have said you might or might not notice it. Just depends on how sensitive you are to it.

If your trying to stay close to the $300.00 that the x2 6850's would be then maybe look at a 7950 MSI? Its right above the $300.00 of the 6850's but would do very well in your system.

http://www.newegg.com/Product/Product.aspx?Item=N82E168...

I almost bought it but went for the 7950 from Sapphire that was OC'ed to 950 from factory.

However, like what jjb did post, the microstutter might drive you mad. Used to happen with my old 4850 setup but then was fixed in a driver build within a month.
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July 5, 2012 7:16:46 PM

that would be nice but i already have one 6850 so basically i would only really be spend 160 dollars... So two cards will save me a lot of money and I can't get money that fast and easily(don't have a job just work around the house)
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a b U Graphics card
July 5, 2012 7:20:00 PM

just remember, if its vram and the first card is 1gb you will only get 1gb in sli
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a b U Graphics card
July 5, 2012 7:20:56 PM

well, in toms hardware best graphics card for the money they do recommend the 6850 crossfire setup, so i dont think there is anything bad with it
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a b U Graphics card
July 5, 2012 7:21:45 PM

oops not SLI, i meant crossfire.....

yea 6850 crossfire or 560 ti 448 core in sli is bang for buck
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July 5, 2012 7:26:39 PM

yeah thats what ive heard that's why I got it but now im worried im going to get a *** load of micrstuddering what do you guys think
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a b U Graphics card
July 5, 2012 7:27:31 PM

well what i have been told is crossfire works out better than SLI and is more stable
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a b U Graphics card
July 5, 2012 7:27:58 PM

Quote:
I'll take the -448's FTW, thanks..

Yep agreed
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July 5, 2012 7:30:37 PM

PanicMaster85 said:
that would be nice but i already have one 6850 so basically i would only really be spend 160 dollars... So two cards will save me a lot of money and I can't get money that fast and easily(don't have a job just work around the house)


Well then sounds like a solid choice from my end looking in.
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July 5, 2012 7:32:02 PM

yeah it does to me I again am hoping and checking the web if there are any problems such as microstuddering or bottlenecking that might make the purchase the wrong choice.
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a b U Graphics card
July 5, 2012 7:32:48 PM

Quote:
:non: 
SLi is more stable..

I know this i was just saying crossfire to give the guy some moral support... were both nividia G's here
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a b U Graphics card
July 5, 2012 7:34:12 PM

Quote:
:non: 
SLi is more stable..



yes thank you


"but someday you're gonna be sorry you cut me. I'm gonna catch on somewhere else and every time that I pitch against you I'm gonna stick it up you're freakin' assss!" Ricky Vaughn
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a b U Graphics card
July 5, 2012 7:35:47 PM

jjb8675309 said:
yes thank you

Wild thing, you make my butt sting

Ah 560 ti sli, i remember those days.....
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a b U Graphics card
July 5, 2012 7:37:40 PM

Rockdpm said:
Ah 560 ti sli, i remember those days.....



I wish I could jump ship to a single 670 but right now is not the time... eventually it'll happen
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July 5, 2012 7:41:36 PM

yeah i heard that a 670 is very powerfull after i get my crossfire ill start saving up for that
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a b U Graphics card
July 5, 2012 7:46:08 PM

ha bro, why buy a 6850 then save up for a 670? just sell save up some more, sell the 6850 and buy a 670...

880? 700 series hasn't even been announced.. get back in da hole
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a b U Graphics card
July 5, 2012 7:49:35 PM

quick question, i'm getting intel over the next few months. give me a vote on what cpu i should get... don't wanna spend over 240$ for a CPU. i already believe i want the ASRock extreme4 z77 for my main board.. the sabertooth z77 is just too much.
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a b U Graphics card
July 5, 2012 7:50:40 PM

Quote:
that's how I did it.
I started GT 240 and that unit now rocks a GTX 580..
wheeling and dealing.

yea i started out with a GTS 450. then 500 series come out, got a 550 ti then built a new rig and a 560 ti then got another 560 ti and ran sli for 4 months then got a 670
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a b U Graphics card
July 5, 2012 7:58:51 PM

Nice, so you previously worked for dell?
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July 5, 2012 8:05:37 PM

Rockdpm said:
quick question, i'm getting intel over the next few months. give me a vote on what cpu i should get... don't wanna spend over 240$ for a CPU. i already believe i want the ASRock extreme4 z77 for my main board.. the sabertooth z77 is just too much.


I recommend the i5 3750
http://www.amazon.com/Intel-Core-3570K-Processor-1155/d...


also who would i sell my 6850 too to get the money completely back and that would cost me 100$ more than if i just bought 2 6850 :p 
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a b U Graphics card
July 5, 2012 9:26:34 PM

^ dude its not a perfect world we live in, cut your losses and move on... you will not get your full value back
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July 5, 2012 9:32:35 PM

Quote:
I rather have a GTX 560 than a HD 6850 anyways...
:sol: 

nah :p 
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July 5, 2012 9:54:46 PM

damnit all to hell :p  i got the wrong damn parts then :( 

:p 
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July 5, 2012 10:08:54 PM

So if I was in your situation again. I'm looking at having to get a a 6850 for ~$130-$150. I would pocket that, sell my other 6850 and go for a 7850.

http://www.anandtech.com/bench/Product/543?vs=549

Ohh and one practice I do take pretty heavily is, when I get something new in my computer, I don't look at the prices until i'm wanting to upgrade again.
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a b U Graphics card
July 5, 2012 10:15:05 PM

Yup, i know everyone was buying the saphire 6850 last year... and i was just standing at the side lines.... wathcing.... just.... smile and wave :) 

So sell your 6850 on ebay for oh say 120-140$ then save up more money and get a 660 or 670
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a b U Graphics card
July 5, 2012 10:16:55 PM

i was told the 2500k is still a good buy, but since the 3570k is only 10$ more in most places... i'd just soon get the 3570k
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