Hello,

I have had some time and I have worked to see if really there are some difference talking about speed using the 3rd revision silicion 355-0026-320 against 355-0026-220. The version 320 is used only in the last 6k revision (3700/3900 A). According to Hank this chip can handle speed over 200MHz.

For testing I have used the V4-4500 AGP. It only comes with one chip vsa-100 and therefore I can handle much better the heat than using a V5.

Normally V4 comes with thoshiba tsop sdram, not friendly high speed. It can run 175-180MHz. So, the first I did is remove the tsop and add 4ns memory and upgrade it 32@64Mb.  Once done the card already is able to handle speed over 200MHz using stock heatsink. In this case both V4 agp reached same speed stable 200MHz.

17/01/2013

Both cards mount the same memory 4ns.



V4-4500 agp comes with 355-0026-220



Unsoldering BGA chip.




I cleaned the bga balls for marking a perfect base for soldering new chip.



New chip VSA-100 355-0026-320 added



Testing the card- Here very scared. I did not know if card will boot up and voila... card did!




Ran Quake III timedemo 1 200MHz.



The cards ready for installing new Heatsink and check speed.



NOTE- Now I need to add a new heatsink in both cards and check if there is or not difference using different rev. My guess is I will get same running speed at same VCore chip. Possibly the 3rd revision silicon is more refined but it will be limited for the Voltage or perhaps the last revision can handle much better the heat.

Best regards,
Oscar.

Thanks Dominik.

Anyway, I do not have too much hope that with the new chip card works faster though.

- Oscar.

Great work Osckhar !

very impressive results, and a professional and clean work !
Looks that you are ready to go over 200Mhz with the voodoo's

did you try more than 200 Mhz ?

I wonder why the 4500 can "so easily" reach 200Mhz, where the 5500 has a lot more trouble with it, any ideas??

Is this because the 4500 uses the 230 chip and the 5500 the 220??

Will check tonight with my cards, have 2 5500 AGP's + 2 PCI's and 1 4500 AGP, very curious.

As for the costs of the rework.......that's a bit expensive for my taste.
I will check how far I can take the cards with the current config.
How much would it cost to just have the ram swapped??

Hi,

Finally I got some time free and did some test.

Here new heatsink for both cards:



V4 Chip Rev. 320 @208MHz



Big size  - https://dl.dropbox.com/u/4383540/my_mods/v4_4800/208MHz.jpg

V4 Chip  Rev. 220 @204MHz



Big size - https://dl.dropbox.com/u/4383540/my_mods/v4_4800/204MHz.jpg

Well, now we can say the last revision O/C better in same condition. The rev. 320 reached 210MHz, but it showed some image corrupted . @211MHz card locked up. The rev.220 locked up 206MHz.

The last test will be upgrade the other card with new revision and see if it gets same speed.

Regards,
Oscar.

Great Results Osckhar
A voltage mod could increase the overclockability, what do you thing ?