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AOC - HD4870@1,1GHz GPU


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Hi guys, we're currently working on this Sapphire HD4870, the goal was to set all the italian hw category records but I'm posting this because, even if it's an old VGA, it still gives us a lot of fun and because of the crazy GPU frequencies reached!

 

This is the screen, taken at the very last thermos of LN2 (the score could be improved by tweaking the OS, this is just a fresh installation with a crappy 2600K):

487001112592.jpg

 

http://hwbot.org/community/submission/2149422_aoc_3dmark2001_se_radeon_hd_4870_112592_marks

 

As you can see on hwbot, 1,1GHz GPU is something that only hipro, pofigist and m4nol reached, wow!

We did a run even at 1110MHz, but the score decreased due probably to high temps or low voltage (1,6v idle, 1,64v full), but we had no more LN2 to improve it.

I hope to be back soon with some 115k+ 01 runs, this VGA deserves it! :)

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Hi Sam, given that there are only 3 people at 1100mhz in 4870 category and 13 for the 4850s, I think that the complexity resides in Gddr5 management for the GPU or to be more precise, for the MC inside the GPU.

In fact, in our early session (it was like 2 years ago, prior to put this vga in the shelf to dedicate to other stuff :D), we couldn't reach more than 1030mhz.

2 weeks ago we completed the vmods by doing VDDQ and Vdimm.

I think that Vddq is the key: by having it at a higher voltage than stock, it gave to the GPU the extra stability needed to go up to 1,1GHz :)

 

2 pics of the card in action:

4870vmod1.jpg

 

4870vmod2.jpg

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No OCP till now :D Don't ask me why, I used high voltages and frequencies so I thought that soon I would be blocked by OVP/OCP but... nothing.

Yeah, on the 4890s you can go very high with the freqs, we have a 4890 Vapor-X that can do 1080+MHz on air, really impossible for 4870s. :)

 

This is our non-reference blue PCB:

Radeon-4870-1GB-Sapphire-toxic-PCB.jpg

 

Those crappy chokes are BOILING! :D

 

@K404: thanks! We MUST find another 5,6+GHz 2600K :)

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  • 3 weeks later...

Update here:

As I said, we just did another run with the 4870 with a better cpu, the goal was to set the new category WR, but we couldn't beat RedCobra's score of 121.527!

Anyway, we reached 2nd spot, with the vga now@1110/1100!

http://hwbot.org/community/submission/2159077_aoc_3dmark2001_se_radeon_hd_4870_120408_marks

 

4870011205k.jpg

 

RedCobra said he's going to put his 4870@ln2, so it would be interesting to find out what he'll manage to get!

We absolutely need a cpu like the one he has (approx. 150mhz better than ours). :)

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  • 2 weeks later...

Tonight we did our last run with the 4870 and finally came the WR at 3DM01!!

We met with Coolbits, we brought his CPU and togheter we worked out this 124,4K!

As you can see from the frequencies, the card is almost degraded, probably the chokes are gone.

So there was plenty of room for improvement but the time was little so we didn't manage to pass the 125K mark, but we're happy as well.

Here is the screen:

screen008e.jpg

 

Finally a run at Aqua, bad efficiency, but the strange fact is that the VGA performs better, speaking about max frequencies... probably it's because Aqua is lighter that 3DM01.

screen002yv.jpg

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