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4850 oc vs 4870 oc

Well my 4870 arrives tomorrow and first job is put it under water, 2nd job overclock it.

I will post results as I get them done but going to have to drain watercooling loop, again so may be Thursday night before I have results.:(
 
I could'nt clock the 4870 any higher then the slider (it maxed out btw) on Overdrive.

I would say that Overclocking the 4850 will deffinitely yield a bigger boost then the 4870 due to the fact the 4850/4870 core is the same, but the DDR3 chokes the bandwidth by a large amount.

Think i will play later with memory clocks alone to show the impact.

Also it pains me to say this, but having owned both 4870 &4850, the 4850 is the better buy - but it desperately needs a better cooler ( as does the 4870) so need to budget another £20 in for that. Then again for me £108 for 4850 + the £15.26 for the S1 makes it still a cracking deal and passively cooled too !
Overall i think its like 25-30% difference (stock) and the gap will/can be narrowed when overclocking as the 4850 seems to have more headroom there. As to how close I can get the margin, once I find a tool that works ill let you know ;)

I am keeping the 4850 and going for another shortly for some CF goodness :)
 
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I'm having trouble using the new AMD clock tool to OC. When you OC in the AMD tool, when you open up CCC, you find that Overdrive mode is ticked again, and it shows the speeds you just selected in AMD tool. All gravy, except when you re-open CCC. For some reason the speeds go back to normal, and when you open up AMD tool and select "show clock speed" it's back to normal.

Anyone know how to make the AMD tool OC stay?
 
Its_Me said:
Also it pains me to say this, but having owned both 4870 &4850, the 4850 is the better buy - but it desperately needs a better cooler ( as does the 4870) so need to budget another £20 in for that. Then again for me £108 for 4850 + the £15.26 for the S1 makes it still a cracking deal and passively cooled too !
Overall i think its like 25-30% difference (stock) and the gap will/can be narrowed when overclocking as the 4850 seems to have more headroom there. As to how close I can get the margin, once I find a tool that works ill let you know ;)

I am keeping the 4850 and going for another shortly for some CF goodness :)
Click to expand...

here's some 4850 crossfire @ 790/1050 pencil mod to 1.3v, usual crap 48x0 3dmark score....just using it as a stress tester.

gotta say i definitely agree with you, 4870 is a nice card but with not many titles not really using the bandwidth of GDDR5 and both cards having the same core the 4850 is incredible value especially if you are willing to play around a bit with the cooling and clock it up.

my cards are loading @ ~50c so i've still got some more room to move also but even if i keep it there ~800 on the core with 2 cards for £230 ain't bad value :p

 
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