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Bottleneck

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May 2, 2012 1:48:50 AM

I have two 6870 and want to know if my AMD 955 is my bottleneck. I am thinking of upgrading to a new mobo and an FX 8150. Also am thinking of getting a new AMD 7000 series card. Which way should I go?

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a c 198 U Graphics card
a b À AMD
May 2, 2012 2:00:08 AM

The 955 should not be a bottleneck at all, and the 8150 would not be much of an upgrade at all whatsoever. With an overclock, the 955 should be able to keep up with a 7k series card, maybe except the high end ones. I would keep the current setup you have right now, since its pretty good. But if you want to upgrade, I wouldn't recommend the 8150.
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May 2, 2012 2:03:21 AM

The 955 is pretty decent. It will probably bottleneck in some games, like Civ 5... but unless a game requires a larger than normal amount of processing power, I don't think it will be a problem.

I can't help but say this, but if you're going to get a new motherboard/CPU, go Intel. The performance from the i5/i7s far exceeds that of the FX series. It's mainly due to the fact that no programs can make use of all those cores just yet. Most programs and applications are made to use 2 cores top, and some support up to 4 threads, that's about it. Getting an octo core processor is a waste in my opinion. If your budget allows for it, go Ivy Bridge i5 or i7, and if it doesn't, Sandy Bridge is still a great option.
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a c 198 U Graphics card
a b À AMD
May 2, 2012 2:26:51 AM

exeedorbit said:
The 955 is pretty decent. It will probably bottleneck in some games, like Civ 5... but unless a game requires a larger than normal amount of processing power, I don't think it will be a problem.

I can't help but say this, but if you're going to get a new motherboard/CPU, go Intel. The performance from the i5/i7s far exceeds that of the FX series. It's mainly due to the fact that no programs can make use of all those cores just yet. Most programs and applications are made to use 2 cores top, and some support up to 4 threads, that's about it. Getting an octo core processor is a waste in my opinion. If your budget allows for it, go Ivy Bridge i5 or i7, and if it doesn't, Sandy Bridge is still a great option.


+1 to that.
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May 2, 2012 3:27:05 AM

I have a 955 at 3.8 with a gtx 680 and there is no bottleneck, also there wasn't any with my old gtx 460sli. I have done my research and AMD is going to release new fx processors as a response to Intel's ivy bridge, so you can actually rather wait. Anyway the best AMD atm for gaming is the Phenom II 1100t.
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May 2, 2012 3:39:11 AM

Can anyone suggest an Intel Mobo that supports crossfire? I am having trouble finding the rigth one. I know that the 1155s do not support dual x16. How much difference will I get with dual x8
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a b U Graphics card
May 2, 2012 3:43:07 AM

LGA 1155 doesn't have enough PCIE lanes to run 2 cards at x16 from the CPU. You'll have to look at the LGA 2011 platform for that. As long as you run PCIE 3.0 x8 (equivalent to PCIE 2.0 x16), you should be fine in terms of bandwidth (but remember you need a GTX 6xx or HD 7xxx card).
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a b U Graphics card
May 2, 2012 3:46:30 AM

The EVGA Z68 FTW (and all other LGA 1155 motherboards with x16/x16 CFX) use an external PCIE chip to get the full bandwidth (with the cost of higher latency), so it doesn't perform as well as an X79 board would but it's better than a regular LGA 1155 board.
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May 2, 2012 3:51:01 AM

aicom said:
LGA 1155 doesn't have enough PCIE lanes to run 2 cards at x16 from the CPU. You'll have to look at the LGA 2011 platform for that. As long as you run PCIE 3.0 x8 (equivalent to PCIE 2.0 x16), you should be fine in terms of bandwidth (but remember you need a GTX 6xx or HD 7xxx card).


So two 6870s would not work in CF becasue it is 3.0?
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a b U Graphics card
May 2, 2012 3:53:24 AM

They would work just fine, but you'd be running them in PCIE 2.0 x8/x8 vs PCIE 3.0 x8/x8 which is double the bandwidth (equivalent to PCIE 2.0 x16/x16). But you can only use the PCIE 3.0 link when you have a PCIE 3.0 GPU like the HD 7xxx or GTX 6xx.
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May 2, 2012 3:54:24 AM

aicom said:
They would work just fine, but you'd be running them in PCIE 2.0 x8/x8 vs PCIE 3.0 x8/x8 which is double the bandwidth (equivalent to PCIE 2.0 x16/x16). But you can only use the PCIE 3.0 link when you have a PCIE 3.0 GPU like the HD 7xxx or GTX 6xx.


I see said the blind man.
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a b U Graphics card
May 2, 2012 4:14:25 AM

Yeah, I personally wouldn't invest in a board with the extra PCIE chip onboard. I'd just grab an Ivy Bridge CPU, Z77 motherboard, and a GTX 6xx or HD 7xxx GPU and not worry about bandwidth at all.
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Anonymous
a c 117 U Graphics card
May 2, 2012 4:20:29 AM

aicom said:
Yeah, I personally wouldn't invest in a board with the extra PCIE chip onboard. I'd just grab an Ivy Bridge CPU, Z77 motherboard, and a GTX 6xx or HD 7xxx GPU and not worry about bandwidth at all.

are you going to make me find a dinosaur bench with a p45 chipset where ALL the pci lanes where not third party?

it does NOT matter!
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a b U Graphics card
May 2, 2012 4:24:51 AM

Anonymous said:
are you going to make me find a dinosaur bench with a p45 chipset where ALL the pci lanes where not third party?

it does NOT matter!


LOL. I agree with you! But, he says he wants an Intel setup with CrossFire and right now nothing's better than a Z77 board with an IB CPU and current-gen GPU. I guess he's got an AMD rig now. No sense in investing in a PCIE 2.0 setup (except on the GPU side in certain cases).
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Anonymous
a c 117 U Graphics card
May 2, 2012 5:55:44 AM

aicom said:
LOL. I agree with you! But, he says he wants an Intel setup with CrossFire and right now nothing's better than a Z77 board with an IB CPU and current-gen GPU. I guess he's got an AMD rig now. No sense in investing in a PCIE 2.0 setup (except on the GPU side in certain cases).

oh.

sorry.

i got distracted arguing about an SSD controller on another thread. rather moot point but . .well i am right! :lol: 

ivy bridge is fine, i am just not excited about it and think that a z68 and i5-2500k is still a great set up. just watch out for some that have a x16/x4 set up that claim to be xfire/sli motherboards.

if he gets a 7000 series card and a i5, either sandy or ivy, he'll wet his pants over the performance difference from a 955.

as much as i love the asus p8z77-v deluxe this is my favorite big boy board:
GIGABYTE GA-Z77X-UD5H-WB $209.99
http://www.newegg.com/Product/Product.aspx?Item=N82E168...

some others
BIOSTAR TZ77XE4 $149.99
http://www.newegg.com/Product/Product.aspx?Item=N82E168...

MSI Z77A-G45 $134.99
http://www.newegg.com/Product/Product.aspx?Item=N82E168...

anything cheaper is the dreaded x16/x4 disease.

this will run pcie 3.0 with an ivy cpu :)  the old favorite around here.
ASRock Z68 Extreme3 Gen3 $121.99
http://www.newegg.com/Product/Product.aspx?Item=N82E168...

overclock?
Intel Core i5-3570K $249.99
http://www.newegg.com/Product/Product.aspx?Item=N82E168...

or not?
Intel Core i5-3450 $199.99
http://www.newegg.com/Product/Product.aspx?Item=N82E168...

so thats $450-$320 high/low costs :) 

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Anonymous
a c 117 U Graphics card
May 2, 2012 3:28:57 PM

xerxces said:
I think I am going to go with Intel this time. Here is what I am going to get.

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

and

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

I think the memory that I currently have will work, at least I hope so.

here are two good reads about the i7:
The Intel Ivy Bridge (Core i7 3770K) Review
Undervolting and Overclocking on Ivy Bridge

you may want to replace that stock heatsink for that.
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