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4770 with 4870 crossfire?

yes it is possible, but don't

unless you plan to overclock your HD4770. I say don't cos the HD4770 my struggle to keep up with the faster card
 
What is the potential overclocks of a 4770?

My 4870 is at 795/930MHz.

If I managed to get a 4770 to those clocks, what would the benefits be of that card? Would I see a performance boost in say BFBC2 and Crysis?
 
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A reference (with voltage tuning) 4770 can go beyond 1Ghz core.

The biggest missmatch is the memory, 128bit GDDR5 vs 256bit GDDR5.

You would be much better by selling the 4870 and moving to a 5830 or 5850 instead.
 
Well if I try it, will my PSU explode or will it just crash? I'm willing to try it if I don't murder my system apart from random crashing, I'll just upgrade the PSU then.
 
There are people running GTX 260 SLI with the HX520 without problems. 4870 CF will be fine.

Think about it, e8400 will take 100-120W...and 2 4870s will take like 250-300 max even with everything overclocked
 
Still far to marginal.




Power consumption

It's time to do some actual testing with these cards. We'll start off by showing you some tests we have done on overall power consumption of the PC. Looking at it from a performance versus wattage point of view, the power consumption is really good with the new 55nm products. Our single card test system is a Core 2 Duo E8400 (3.0 GHz) processor, the nForce 680i SLI mainboard, a passive water-cooling solution on the CPU, 2GB memory, DVD-ROM and WD Raptor drive. Have a look:

Power Consumption Idle Wattage Max Wattage
Radeon HD 4670 512MB 115 207
Radeon HD 4850 512MB 156 267
Radeon HD 4870 512MB 183 336
Radeon HD 4870 512MB 186 337

A single Radeon HD 4850/4870 series requires you to have a 500 Watt power supply unit at minimum if you use it in a high-end system, and I think that's barely on the safe side. Also recommended is 32 AMPs on the 12 volts rails for stable power distribution (in a single card configuration). Please make note of the fact that the card uses two 6-pin power connectors.

Crossfire is something else, you add another 160 Watts plus ~10 AMPs on the 12V rails during gaming. I recommend a PSU of, at the very least, 750-800 Watts. Make sure you have some reserves folks. It's not that your PC will consume that much power, it's just that you want to make sure your PSU can deal with the hefty load and will stay stable during your entire gaming experience.
Click to expand...
 
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Id estimate you would be drawing about 475w with a CF 4870's, thats assuming a couple of case fans, 1 hdd, 1 dvdrw and 2 sticks of ram, as your E8500 is over clocked I exaggerated its power draw to compensate
 
When i had my E8500 running at 3.8Ghz and a 4870 the maximum power draw at the wall was 274w. Even then that was only by running Prime and fur stability test at the same time. Normal gaming use was around 227w.
 
I've got like 5 fans, 2x HDD (WDC Blue 320 and 640), 1DVDRW, 2x 2GB DDR2 Ram.

E8500 at 1.41V or so it says, probs around 1.37V and 4GHz.
 
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