can i turn 5850 to 5870

[newfusion]

hey guys,
i just read and article about how u can change the 5850 to 5870,what i means in to unlock the core of the GPU. and what the side effect when we to that?
and one more can i make matrik GPU

 

[borisvodofsky]

No. don't do this.

 

[happy medium]

The only way to do this is to sell your 5850 and buy a 5870.

 

[RussianSensation]

The best way is to overclock the GPU on the 5850.

850 mhz on the GPU and 4800 memory speeds do the trick : http://www.xbitlabs.com/articles/video/display/radeon-hd5850_5.html

 

[happy medium]

The best way is to overclock the GPU on the 5850.

850 mhz on the GPU and 4800 memory speeds do the trick : http://www.xbitlabs.com/articles/video/display/radeon-hd5850_5.html

850, 4800 memory is the same as a stock 5870, how is that possible?:hmm:

 

[dug777]

850, 4800 memory is the same as a stock 5870, how is that possible?:hmm:

I can easily break 4800 (1200 quad pumped) on my XFX 5850 BE memory, and 850 core is a doddle, I can break 1Ghz fiddling with the voltage (again using MSI Afterburner) if I so desire.

Most people on here seem to be able to get pretty brutal oc's with 5850s on here...

EDIT: Aha, I see the point you are making.

Looking at those benchmarks it's still a teeny bit behind the 5870 at those clocks. I guess the software isn't getting maximum leverage out of the extra shaders on the 5870 in many cases...

 

[happy medium]

I don't quite follow your line of reasoning

You increase clock speeds using a programme like MSI afterburner.

I can easily break 4800 (1200 quad pumped) on my XFX 5850 BE memory, and 850 core is a doddle, I can break 1Ghz fiddling with the voltage (again using MSI Afterburner) if I so desire.

Most people on here seem to be able to get pretty brutal oc's with 5850s on here...

I thought Russian was saying that a 5850 overclocked to 850 core 4800 memory would = a 5870? That can't be right? Thats the same clocks as a 5870.

 

[dug777]

I thought Russian was saying that a 5850 overclocked to 850 core 4800 memory would = a 5870? That can't be right? Thats the same clocks as a 5870.

Those benchmarks suggest it's pretty damn close

 

[pcgeek11]

YES! Just turn the second 5 in the 5850 to a 7. like this 5870.

Easy

 

[RussianSensation]

5850 overclocked to 850 core 4800 memory would = a 5870? That can't be right?

Well I think there is a possible explanation (just using my logic). Looking at the specs:

5850 has a texture fill-rate of 52.2 GTexels/sec vs. 34 GTexels/sec for the GTX470.
5850 has a pixel fill-rate of 23.2 GPixels/sec vs. 24.3 GPixels/sec for the GTX470.
5850 has a memory bandwidth of 128 GB/sec vs. 134 GB/sec for the GTX470.

We know that 5850 is slightly slower than the GTX470 in modern shader intensive games up to 1920x1200. This means that texture fill-rate is just not that much of a factor in modern games at that resolution or otherwise 5850 would be much faster. However, in games like Prey, Wolfenstein and Quake 4 (more texture dependent - http://www.techpowerup.com/reviews/Zotac/GeForce_GTX_460_1_GB/18.html), 5850 is actually faster than the 470. Texture fill-rate becomes a major limitation at 2560x1600, again where the GTX470 loses to the 5850 and loses by 30% to the 5870.

"The bottleneck of the GF100 architecture – the low main domain frequency and the cut-down TMU subsystem (the GeForce GTX 470 has only 56 TMUs) – shows up most clearly at 2560x1600" - http://www.xbitlabs.com/articles/video/display/gigabyte-gf-gtx400_17.html#sect0

But what happens at 1920x1080 where TMUs are not a factor yet? "The Full-HD mode (1920x1080) has become a de-facto standard and the GeForce GTX 470 feels less confident here than in the previous case. It is now an average 1% slower than the Radeon HD 5870." (same link as above).

Ok now back to 5850. At 850mhz on the 5850 GPU, you are looking at identical Pixel fill-rate of 27.2 GPixels with the 5870. We know that up to 1920x1200, 5850's texture fill-rate advantage over 470 doesn't show up. Therefore, the 72 TMUs of the 5850 aren't going to be much slower than 80 TMUs of the 5870, unless you are at 2560x1600.

The minor performance difference is likely accounted for by the reduced memory bandwidth of the overclocked 5850 to 5870's rather than the texture-fill rate disadvantage.

 

[happy medium]

Well I think there is a possible explanation (just using my logic). Looking at the specs:

5850 has a texture fill-rate of 52.2 GTexels/sec vs. 34 GTexels/sec for the GTX470.
5850 has a pixel fill-rate of 23.2 GPixels/sec vs. 24.3 GPixels/sec for the GTX470.
5850 has a memory bandwidth of 128 GB/sec vs. 134 GB/sec for the GTX470.

We know that 5850 is slightly slower than the GTX470 in modern shader intensive games up to 1920x1200. This means that texture fill-rate is just not that much of a factor in modern games at that resolution or otherwise 5850 would be much faster. However, in games like Prey, Wolfenstein and Quake 4 (more texture dependent - http://www.techpowerup.com/reviews/Zotac/GeForce_GTX_460_1_GB/18.html), 5850 is actually faster than the 470. Texture fill-rate becomes a major limitation at 2560x1600, again where the GTX470 loses to the 5850 and loses by 30% to the 5870.

"The bottleneck of the GF100 architecture – the low main domain frequency and the cut-down TMU subsystem (the GeForce GTX 470 has only 56 TMUs) – shows up most clearly at 2560x1600" - http://www.xbitlabs.com/articles/video/display/gigabyte-gf-gtx400_17.html#sect0

But what happens at 1920x1080 where TMUs are not a factor yet? "The Full-HD mode (1920x1080) has become a de-facto standard and the GeForce GTX 470 feels less confident here than in the previous case. It is now an average 1% slower than the Radeon HD 5870." (same link as above).

Ok now back to 5850. At 850mhz on the 5850 GPU, you are looking at identical Pixel fill-rate of 27.2 GPixels with the 5870. We know that up to 1920x1200, 5850's texture fill-rate advantage over 470 doesn't show up. Therefore, the 72 TMUs of the 5850 aren't going to be much slower than 80 TMUs of the 5870, unless you are at 2560x1600.

The minor performance difference is likely accounted for by the reduced memory bandwidth of the overclocked 5850 to 5870's rather than the texture-fill rate disadvantage.

After reading that I conclude that for 390$ the 5870= suckage.

 

[dug777]

After reading that I conclude that for 390$ the 5870= suckage.

newegg has them for 370 at the moment, but amen to that, brother

At least, if you are happy to overclock and take your chances, but from what I have seen on here at least, 5850 overclocking seems generally excellent. I am certainly very happy with mine

 

[pmurgs]

Set your 5850 to 930 core and 1200 mem and it will perform the same (if not a tiny unnoticable bit faster) as a 5870. Pretty much all reference design 5850's can achieve a 930 overclock on stock cooling. Memory speed doesn't matter nearly as much as core to performance over 1000 on the 58XX series.

 

[newfusion]

so its not true that 5850 can be 100% like they say....im runing on CF 5850 can be the same as single 5870.

 

[happy medium]

so its not true that 5850 can be 100% like they say....im runing on CF 5850 can be the same as single 5870.

CF 5850's will kill a 5870. What cpu do you have?

 

[Ben90]

Thnx for that post Russian. At first I was reading the 5850 vs 470 comparisons, and was like: oh jeeze another pointless NVIDIA vs ATI post. Very informative though.