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Legion Hardware » Articles » Radeon HD 5870 Crossfire CPU Scaling Performance Part 1

Radeon HD 5870 Crossfire CPU Scaling Performance Part 1
[Posted by: Steve]
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The time has come once again for us to take a pair of the gaming industry’s fastest performance graphics cards and couple then with a range of processors from both AMD and Intel. In this first part, which will be just one of many, we are taking the Core i7, Core i3, Phenom II X4, Phenom II X2 processors and testing them with Radeon HD 5870 Crossfire graphics cards at frequencies from 2.0GHz through to 4.0GHz...

However what the data recorded in this article suggests is when future games became more demanding on the CPU, the Core i7 is going to provide a higher level of performance. While this is a very likely scenario, the Core i7 has been available for well over a year now and this still has not happened. Therefore in terms of value, the Phenom II X4 still makes more sense for gaming purposes.

03/06/2010
« Supreme Commander 2 Performance · Radeon HD 5870 Crossfire CPU Scaling Performance Part 1 · Asus P7H55-M Pro vs. Gigabyte H55M-UD2H »

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ProX



Posted on: 03/10/2010 08:41 AM
The Core i7 system is triple-channel and the Phenom II is dual-channel. So one has 3 sticks of 2GB memory and the other has 2. At the end of the day I am yet to see a game that performs better with 6GB of memory when compared to 4GB so this is a none issue, maybe Steve has more info on this.

Also for most people 2560x1600 is a huge resolution, add another 30" screen and you can pretty much just halve the performance.

Not sure what Xbox 360 games you have been playing but the PC equivalent always looks worlds better in my opinion. Half the reason why Crysis never went to console is because it was way to demanding.

don´t like it



Posted on: 03/10/2010 09:16 PM
There´s no such information about phenom II NB Overclock speed.
In fact the Crossfire Scaling changes a lot with NB overclocked to 2.6ghz or 2.8ghz. Phenom II is bandwith Starved. It´s not true for the I7. Core i7 has turbo mode. Phenom II does not.
So when overclock a Phenom II you have to overclock the NB clock ALSO.

cheers
Rodrigo

Please read this!!!



Posted on: 03/10/2010 09:32 PM
http://www.anandtech.com/mb/showdoc.aspx?i=3533&p=5
the guys at anand got 12% more speed just with NB Overclock.


Well, I got huge 3000 points in 3dmark 2006 JUST WITH NB OVERCLOCK with phenom II.
Also I got some 7000 ponts in 3dmark 2001 just with NB OVERLOCK

The rule is... if you overlock your processor to 4ghz , you will need at least 2.8 to 3.0ghz NB Speed.

ProX



Posted on: 03/10/2010 11:04 PM
Clearly neither of you guys can read. First of all they were not using turbo mode. Second of all they said they overclocked the processors as close to their standard settings as possible for fair results. Finally if you look at the 2.0GHz and 2.4GHz data the margins are the same at 4.0GHz so put that in ya pipe and smoke it.

Steve



Posts: 76
Joined: 2010-02-08

Posted on: 03/27/2010 10:24 PM
Posted by White on 03/27/2010 10:18 PM
PS: On part 2 if you are doing C2Q please do 45nm. Also, would have been nice to see how i5 fairs with these result, although I expect them to be very similar to i7.


Thanks for the feedback. The Core 2 Duo E8xxx series and Core i5 results along with half a dozen other processors will be online in the first week of April.

White



Posted on: 03/27/2010 09:18 PM
Great job Steve.

I've been waiting for this article and you put a lot of arguments to rest.

This is the first properly done article I have seen today that compares i7 and Phenom II in gaming performance.

The dual core results are interesting as well.

Great job! 2 thumbs!!

PS: On part 2 if you are doing C2Q please do 45nm. Also, would have been nice to see how i5 fairs with these result, although I expect them to be very similar to i7.

Julian



Posted on: 04/07/2010 12:37 AM
Great article keep the benches coming!

Pdp



Posted on: 09/05/2010 11:17 PM
Yes we all know Intel have a better chips at the top end, benchmarking is fair enough but thats just bragging rights. But, in the real world of gaming the i7 965extreme costs £650 the x4 965 £120. But ya sure don't get 5.5 x the performance.

On some benchmarks even the little i3 has better performance than its bigger brother. My point being its all about bang per buck. Even the X2 555 gets to within 75% minimum frame rate (crysis) of the i7 965 and that costs a meager £70, thats a wopping 9x price difference.

Then you have the possability of unlocking 3 or all of the cores. With a descent motherboard. So its £800 i7/+mobo vs £170 X2 555/+ mobo. I know what I'd choose everytime.

The £600 saving I go for X2 HD 5850 and water cooling. For even better performance. Then again any improvement over 60fps you won't notice any way as it's above the refresh rate of 90% of tft monitors!!!!!!!!!!!

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