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XFX 7850 2GB or XFX 6870 2GB?

Last response: in Graphics & Displays
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June 28, 2012 9:24:18 PM

I need to buy a new video card. Problem is, it's pretty tough to find a perfect match.

I've looked at the XFX 6870 2GB (link here: http://www.newegg.com/Product/Product.aspx?Item=N82E168...)

and I've also looked at the XFX 7850 2GB (link here: http://www.newegg.com/Product/Product.aspx?Item=N82E168...)

and I can't decide which to get.

One would think it would be an easy choice, but the 6870 has more "Stream Processors" and a higher "Core Clock".

...

I have the following setup:

AMD A6-3650
Patriot G2 1333MHz DDR3 2x4GB
Ultra 450w PSU

...

Which graphics card will perform better at 1920x1080 with fully-maxed out games (AA and AF all the way up, and everything else too)?

Will I need to upgrade my power supply? And if so, can you suggest one? I'd like it to be around $80 tops. I want to spend only around $300 for this entire upgrade... give or take $20-30.
June 28, 2012 10:13:52 PM

Both cards are reference clocked cards.

The Radeon HD 7850 will outperform the Radeon HD 6870 at all resolutions.

For a system using a reference clocked single Radeon HD 6870 graphics card AMD specifies a minimum of a 500 Watt or greater power supply. The power supply should also have a combined +12 Volt continuous current rating of 28 Amps or greater and have at least two 6-pin PCI Express supplementary power connectors.

For a system using a reference clocked single Radeon HD 7850 graphics card AMD specifies a minimum of a 500 Watt or greater power supply. The power supply should also have a combined +12 Volt continuous current rating of 27 Amps or greater and have at least one 6-pin PCI Express supplementary power connector.

Your Ultra LSP450 450-Watt Power Supply, with its combined +12 Volt continuous current rating of 24 Amps and with one 6-pin PCI Express supplementary power connector, is insufficient to power your system configuration with either a single Radeon HD 6870 or a Radeon HD 7850.

Take a look at the Rosewill CAPSTONE Series 550W (CAPSTONE-550) for $79.99, with its combined +12 Volt continuous current rating of 45 Amps and with two (6+2)-pin PCI Express supplementary power connectors, is more than sufficient to power your system configuration with either a single Radeon HD 6870 or a Radeon HD 7850. It is also sufficient to power your system configuration with two Radeon HD 7850 in 2-way CrossFire mode.
June 28, 2012 10:18:34 PM

"stream processors" and "core clock" can not be compared between architectures. the 7850 is the replacement for the 6950 and superior in every way to a 6870.

That being said your CPU is very low end for gaming and both may be overkill. what is your resolution?
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June 28, 2012 10:46:32 PM

7850...the 2gb xfx has the voltages locked and is terrible at overclocking...I would know,I have one :( 
June 28, 2012 10:57:36 PM

EchoOne said:
7850...the 2gb xfx has the voltages locked and is terrible at overclocking...I would know,I have one :( 

I agree with you. Even the XFX Radeon HD 7850 Black Edition has horrible overclocking potential.
June 29, 2012 7:58:12 AM

I'm going to upgrade my CPU later on, but I can't afford to upgrade both my CPU and GPU right now.

ko888, would this PSU work well too? It's cheaper and has a higher wattage: http://www.newegg.com/Product/Product.aspx?Item=N82E168...

I've looked around and I really like XFX... not to mention the fact that I'll save a few dollars on them.

I don't plan on overclocking

Final note: with my current setup AND the addition of the XFX 7850 2GB and Corsair 600w, will I be able to play games like: Fallout 3, Left 4 Dead (1 and 2), NBA 2K13, Call of Duty: Modern Warfare 3 and Black Ops II, Hitman: Absolution, and maybe Grand Theft Auto Five at High/Max settings? If the answer to that is no, will a CPU upgrade to the AMD A8-3870k be of any help?
June 29, 2012 4:09:13 PM

reboh79 said:
...
ko888, would this PSU work well too? It's cheaper and has a higher wattage: http://www.newegg.com/Product/Product.aspx?Item=N82E168...
...
The Corsair Builder Series CX600 V2 (CMPSU-600CXV2), with its combined +12 Volt continuous current rating of 40 Amps and with two (6+2)-pin PCI Express supplementary power connectors, is more than sufficient to power your system configuration with a single Radeon HD 7850. It is also sufficient to power your system configuration with two Radeon HD 7850 in 2-way CrossFire mode.
June 29, 2012 7:05:30 PM

unksol said:
"stream processors" and "core clock" can not be compared between architectures. the 7850 is the replacement for the 6950 and superior in every way to a 6870.

That being said your CPU is very low end for gaming and both may be overkill. what is your resolution?

I plan on playing at 1920x1080.
June 30, 2012 6:54:57 PM

I have a 7850 and its awesome...
Just install the ASUS GPU tweak it controls the voltage !!! and its stable
!