GTX 260 SC Edition overclock?

Does any one know why after overclocking my GPU to 740/1485/1200 fan 80% my 3DMark benchmark went from 19694 at stock clock to 14405 after the overclock? Doesn't make any sense to me! Ran OCCT with no errors.

Cooler Master HAF 932
Intel Quad Core Q6600 OC@ 3.0 Ghz
Noctua NH-D14 HS
Evga 750I FTW Mobo
Evga GTX260 Super Overclocked Edition GPU
Corsair TX750W PSU
G.SKILL 4GB (2 x 2GB) DDR2 1066 (PC2 8500)
Western Digital Caviar Black SATA 3.0Gb/s 1TB 7200 RPM
Hanns·G HG-281DPB 1920 x 1200
Windows XP Professional SP3 32-bit for System Builders
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  1. Well I figured out what was going on I think. When I would attempt my overclock and it would fail it would just downclock and stay at that downclock unless I rebooted. So if I ran 3DMark with the (locked) downclock my benchmark score would dramatically drop! If i reset precision and rebooted then I would be back at stock clock and my benchmark score would be much better. I have been trying and trying to overclock and using Ati I show no errors and have no problem running 3DMark but then as soon as I start OCCT I show a whole boat load of errors unless I'm at stock clock.

    I have been raising shader/memory/core 10 Mhz at a time but so far can't seem to get this thing to overclock without errors with OCCT. I have the latest display driver and version of precision. I'm going to try Evga's OC Scanner to see if that makes any difference.
  2. Open up CPU-Z and check to see if you have the 55nm or 65nm version. I had the 55nm version and was able to OC the card pretty far by raising the voltage, example :

    More info on voltage control :
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