The first thing attempted was to flash the OEM card with an overclocked version of manufacturer specific GTX 460 BIOS, in this case a 1Gb MSI Hawk. The reasoning for this was to try and gain control of the card in MSI's AfterBurner utility, but although the core and memory clocks saw a nice bump, voltage adjustments were still not possible. Also the Device ID was not changed by the BIOS flash, it remained 0E24, which as mentioned may cause difficulty in running SLI with other 0E22/23 cards.
When it was discovered that NVIDIA Inspector could modify clocks and voltages just as easily, the card was returned to the stock BIOS. Then using manual trial and error, the maximum stable clocks for the GTX 460 OEM were found to be 830/2100 at the default voltage and with fan left on auto speed. These clocks are very user friendly as the card only runs a few degrees warmer than stock and the fan doesn't go much above 50%, which is the point when the noise first begins to become noticeable outside the case.
As seen in previous screenshots, the GTX 460 OEM will throttle its clocks down to just 51Mhz core, 135Mhz memory with only 0.88v when the card is sitting in 2D mode. Coupled with AMD's Cool & Quiet feature, total system power usage is under 100W at idle. Firing up FurMark 1.8.2 to generate a load on the GPU we see power consumption jump to 260W, and overclocking the card results in an extra 40W more. Because we can't separate the GPU load entirely, those numbers do include additional watts used by the CPU as well, however it is somewhat concerning to see a 200W load from what is supposed to be a 150W max TDP video card.
Temperatures are very reasonable for this card, particularly given the skimpy cooler design. Keep in mind however it is operating off reduced voltage of just 0.95v which is more than a tenth of a volt less than a retail GTX 460. Curious to see how the OEM card would handle higher voltage, I increased the fan to 100% and bumped it up to 1.1v, however putting a heavy load on the GPU at that level quickly resulted in temps approaching 90°C. For really serious overclocking you are going to want some aftermarket cooling on there.
Let's see how the GTX 460 OEM performs stock and overclocked in some benchmarks.