I recently bought the XFX RX460 P4HFG5 Fanless GPU to replace my old HD7750 iSilence.
i7-4770K, 16 GB RAM, Win7-64 Pro, Crimson 16.12.2
XFX advertises this card as a 1220 MHz clock speed. It also advertises the GPU clock is regulated by "True Clock":
Software controlled clock speed optimizers can be hindered by overall computer performance, heavy loads can cause it to misread the maximum potential clock speed of the graphics card at any given moment. XFX's True Clock however is hardware controlled clock speed performance optimization so it's always running at peak performance all the time.
When running Unigine Benchmark or the GPUz rendering test, it does indeed reach and maintain 1220 MHz. However, when running Folding @ Home, it initially settled in around 1140 MHz at 100% load. After several inquiries to XFX support, their (email@example.com - NOT the support ticket folks) recommendation was to increase the power limit. So far, increasing the limit by 15% in MSI Afterburner gives 1160-1180 MHz while Folding, depending on Work Unit. Temp and power limits are not factors, at 64C and 58 Watts peak (62C and 56 W nominal), respectively.
trying to determine if this is a defective card, or if True Clock needs tweaking via Firmware, hardware, or driver fixes.
Except for this apparent anomaly, I am happy with the card as a low-power, low-noise solution.