Crossfire question with two different series

[Tsugayashi]

Manufacturer: Gigabyte Technology Co., Ltd.
Processor: AMD Phenom(tm) II X4 955 Processor, MMX, 3DNow (4 CPUs), ~1.6GHz
Memory: 3326MB RAM (DDR3)
Hard Drive: 1 TB
Video Card: ATI Radeon HD 4800 Series (4850 to be exact)
Monitor: http://www.newegg.com/Product/Product.aspx?Item=N82E16824236047
Sound Card: Internal
Speakers/Headphones: Altec Lansing SRS Headphone
Keyboard: Razer Lycosa
Mouse: Razer Lachesis
Mouse Surface:
Operating System: Windows XP Professional (5.1, Build 2600) Service Pack 3 (2600.xpsp_sp3_qfe.090206-1316)
Motherboard: Gigabyte GA-MA790XT-UD4P
Computer Case: Sunbeam Transformers Black

So now that the specs are out of the way... my question is this.

I have recently purchased a HD 5750 and am curious as to whether or not it is worth, or even safe, to crossfire with my current HD 4850.

The 5750 is manufactured by ASUS and the 4850 is regrettably manufactured by Sapphire. Taking a look at the benchmarks between the two, they normally perform about the same, and I don't play many GPU intensive games on this pc.

 

[paperfox]

You cannot crossfire the 4850 and the 5750 togeather.

 

[megamanx00]

No.

You can crossfire any 4800 series card with any other 4800 series card (like a 4830 and a 4890), but you can't mix it up with a 5700 series card. You may want to consider returning your 5750 and getting another 4850 instead. After all the 5750 is only a minor improvement over a 4850. You could also sell your 4850 and use the money towards another 5750.