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[Various] AMD R9 295x2 Reviews - Page 31

post #301 of 539
All this talk of CF goodness makes me wanna tear down my mining rigs and run the 280X on my X58 SLI just for the epeen...

Maybe some day when I have the time...
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post #302 of 539
Quote:
Originally Posted by TheLAWNOOB View Post

All this talk of CF goodness makes me wanna tear down my mining rigs and run the 280X on my X58 SLI just for the epeen...

Maybe some day when I have the time...

My mining rigs have been off for almost 3 weeks now... not really profitable at current prices.
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post #303 of 539
Quote:
Originally Posted by azanimefan View Post

and drawing less power... yep.

Can you please show us the review that states this?

Anand, PcPer and HWC have the 295x2 drawing 80-100 more watts than the 780 Ti SLI.

Hardocp had their 295x2 drawing 198 watts more than 780 Ti SLI.

So Hardocp's 4k numbers don't correlate with anyone else's 4k results and their gap in the power draw between the cards is double everyone else as well.
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post #304 of 539
but according to most here, mining is the future and gpu mining will never die? tongue.gif
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post #305 of 539
Quote:
Originally Posted by mcg75 View Post

Can you please show us the review that states this?

Anand, PcPer and HWC have the 295x2 drawing 80-100 more watts than the 780 Ti SLI.

Hardocp had their 295x2 drawing 198 watts more than 780 Ti SLI.

So Hardocp's 4k numbers don't correlate with anyone else's 4k results and their gap in the power draw between the cards is double everyone else as well.
Not 780 but Titan Black. Haven't seen a chart with 780Ti pulling more in SLI.
post #306 of 539
Quote:
Originally Posted by Durquavian View Post



Not 780 but Titan Black. Haven't seen a chart with 780Ti pulling more in SLI.

It depends on the gaming suite, really. Tech Report is using one with a few nvidia friendly games and naturally, Kepler will win often there.
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post #307 of 539
Quote:
Originally Posted by Blameless View Post

Quote:
Originally Posted by B NEGATIVE View Post

My prediction of the cooling being effective in an earlier,locked thread has come to pass....

Effective is pretty relative.

I don't think anyone doubted that the part would work, but it's cooling is not dramatically more effect than the reference cooler on a 290X is.
Quote:
Originally Posted by B NEGATIVE View Post

A120 rad is plenty good for a pair of GPU dies as proven by the ARES dual solution. How thick a rad is is irrelevent when you are talking 5/10mm difference.

The ARES wasn't dual Hawaii and 10mm thicker than the 40mm radiator on the GTX 295X2 is potentially ~25% more fin area, all other things being equal.

The idea that the 295X2 had to work because the ARES II worked is an utterly unfounded leap based on faulty logic; they are not comparable. The 295X2 had to work because they wouldn't be able to sell it if it did not.

I'm still waiting for some tests on the 295X2 with throttling disabled in something like OCCT or FurMark so we can see how well the cooling handles actual peak loads.
Quote:
Originally Posted by Blameless View Post

Quote:
Originally Posted by B NEGATIVE View Post

My prediction of the cooling being effective in an earlier,locked thread has come to pass....

Effective is pretty relative.

I don't think anyone doubted that the part would work, but it's cooling is not dramatically more effect than the reference cooler on a 290X is.
Quote:
Originally Posted by B NEGATIVE View Post

A120 rad is plenty good for a pair of GPU dies as proven by the ARES dual solution. How thick a rad is is irrelevent when you are talking 5/10mm difference.

The ARES wasn't dual Hawaii and 10mm thicker than the 40mm radiator on the GTX 295X2 is potentially ~25% more fin area, all other things being equal.

The idea that the 295X2 had to work because the ARES II worked is an utterly unfounded leap based on faulty logic; they are not comparable. The 295X2 had to work because they wouldn't be able to sell it if it did not.

I'm still waiting for some tests on the 295X2 with throttling disabled in something like OCCT or FurMark so we can see how well the cooling handles actual peak loads.

My faulty leap of logic was correct,the dies are different but the song remains the same.

Similar temps to the ARES with less rad and hotter chips....I may not be the hottest on GPU's but watercooling? I'm all about it,its what I do. How you can assume that they would behave different? Each dies has a similar heat output,they are very comparable.

10mm difference is immaterial,the depth of the tube rows and quantity of tube rows is what matters,not total depth.

As for it being comparable with air,that is false,an aircooler serving both dies would not be in the same neighbourhood as this AIO setup.
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post #308 of 539
Quote:
Originally Posted by B NEGATIVE View Post


My faulty leap of logic was correct,the dies are different but the song remains the same.

Similar temps to the ARES with less rad and hotter chips....I may not be the hottest on GPU's but watercooling? I'm all about it,its what I do. How you can assume that they would behave different? Each dies has a similar heat output,they are very comparable.

10mm difference is immaterial,the depth of the tube rows and quantity of tube rows is what matters,not total depth.

As for it being comparable with air,that is false,an aircooler serving both dies would not be in the same neighbourhood as this AIO setup.

GPUs are much better at showcasing the advantage of water cooling over air cooling... They really put intels IHS and TIM to shame.

400+ watts off a 120mm radiator sounds pretty decent, the only problem you might run into with this is that the water temperatures are very high and might cause degradation in the pipes/pumps/seals.

The delta temps of the ARES 2 compared to the 295x2 seem to match what I'd estimate are the thermal profiles for the cooling systems. ~35C delta for A2 and ~40C delta for the X2, add to that the fact that the rad is thicker and can accommodate maybe ~20% more heat dissipation (probably limited by the airflow through the rad).

That 20% makes sense when you compare the amount of watts dissipated/degree delta which would be 375/35 and 500/40. The former being ~10.7w/C and the latter ~12.5w/C the second solution providing ~17% better w/C values.

The thicker rad makes a difference. But, I doubt you'd run into much trouble when loading one of these with Furmark or OCCT, the throttling does kick in at 75C, so it might happen, but that is probably the limit because of the fact that the pumps and coolant loop are not designed to operate at higher temperatures, which logically will be significantly higher than those encountered on a custom loop. If this was combined with a 240mm rad there would be a great load of overclocking headroom.
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post #309 of 539
60c coolant temp is the danger point for pumps in extended running,you are unlikely to see that happening.
Also,IIRC,the ARES came with 2 fans and this came with one? That is more likely to give the 20% rather than any rad thickness.

GPU watercooling performance has nothing to do with IHS and TIM specs,the difference is heat density,the GPU has its heat spread out,the CPU has them in very localised spots over the cores. That is the reason for the excellent watercooling performance.
Edited by B NEGATIVE - 4/10/14 at 5:06am
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post #310 of 539
I think the Ares 2 had one central fan like this for the vrms also.
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