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Anonymous
June 28, 2012 9:24:18 PM

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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.
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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 :( 
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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.
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Anonymous
June 29, 2012 7:58:12 AM

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June 29, 2012 4:09:13 PM

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