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View Full Version : What's the tiny core in 6600?


zwazd
04-30-05, 01:51 AM
If you own this card, you'll see it has 2 cores that connect to the sink. I wonder what the small one does? Because I cracked the core a little bit by screwing the heatsink tighter. I screw it slowly, I dont know why it cracked so easily.

But luckily , it seems to work still.

GlowStick
04-30-05, 02:00 AM
Erm, if its an AGP 6600 its the PCI-Express to AGP bridge chip.

zwazd
04-30-05, 02:21 AM
Yes , It's agp part. Is it important? Will I be using that bridge function?

Cinema4DXL
04-30-05, 02:34 AM
um yes its important because it provides the AGP interface for the GPU

jolle
04-30-05, 03:28 AM
Sortof translates the PCI-E protocol coming from the GPU into AGP before it hits the AGP bus, and then translates the AGP signal from the bus into PCI-E signals when its going to the GPU.

gstanford
04-30-05, 08:46 AM
this is a perfect illustration of the dodgy heatsink retention scheme of many GF 6600 cards.

The pressure caused by the heatsink acting as a lever on one of the 2 retention pins is quite deady, especially as 6600 cores seem to be quite fragile. Something as simple as grabbing the card by one corner of it heatsink can kill the GPU.

zwazd, I suggest you test the card thoroughly - use 3dmark03, 3dmark05, rthdribl etc to verify there really is no damage. Because you played around with the heatsink you probably won't have warranty cover if the card is damaged.

nVidia really needs to revise their reference pcb layouts for the 6600 series to stop this from occuring in the future.

zwazd
05-01-05, 06:28 AM
Now I notice a very long loading time, not sure it's the card problem.

If anything goes wrong within a month, I'll report back here.


Thanks all.

Anril
05-01-05, 07:44 AM
My PCI-E 6800 Ultras also have the extra little core. Are we sure it's a bridge core?

saturnotaku
05-01-05, 07:46 AM
My PCI-E 6800 Ultras also have the extra little core. Are we sure it's a bridge core?

Yes because the 6800 parts were desgined as AGP, so they need a bridge that works in the opposite way of the 6600.

gstanford
05-01-05, 08:52 AM
Yes, it is a bridge chip.

NV43 (the 6600 series gpu) is native PCI-e so the bridge chip is added for AGP compatability.

Likewise NV40 is native AGP so GF6800 GT, Ultra and early non ultras use the bridge chip for PCI-e compatability.