Question about videomemory chips - PLS ANSWER

I'd hazard a guess it's because that is a 64Mb chip that you have broken and it is now only able to see half the memory. As you have halved the memory you have also halved the bus widith.

It might be possible to fix it. If removing the heatsink broke one of the connections to the board a quick touch with a soldering iron might bring it back. But not one for the faint hearted.

Hmmm.. two pairs of 2 chips. Could be taking out one has killed the other?? I did say it was a guess.

And how do you know its only that chip that is broken? Just because the others look ok doesn't mean they are not damaged...

thanks for explaing that MUCH better than I was...

Do you understand english?? I said the chip capacity in bits not in bytes!

Do the calculations:
256Mbit x 4 chips = 1Gbit
1Gbit / 8bit = 128MBytes
do you understand this? Ok.

The bus width changes because each of the 4 chips provides 64bit of data:
64bit x 4 chips = 256bit.

So if a chip is broken you have only the 192bit of the other three, but the RAM controller can only work with 128 or 256 bit buses, so it uses only 2 chips, leaving the third unused.

You can tell by his spelling that english isnt his first language, go be a dick to somebody else.....like me