If you lapp the metal circle you'll see the imprint of the actual chip in the centre. Those chips gain alot from lapping, even the metal/copper ones on Gf's are bowed to ****!!(do a test with a lapped HS and some thin heatpaste to see where it mates!) I got a huge increase in memory performance lapping the NB and still using the stock cooler! Managed to tighten the mem latency right up...
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