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Chaintech VNF4 Ultra Zenith VE Review
Author: Dennis Garcia
Published: Tuesday, April 19, 2005
Bios Features
The BIOS is very self-explanatory and includes many enthusiast friendly controls for overclocking and system tuning.
Overclocking on the Athlon64 is a little different than on other systems due to the addition of HTT and LDT. HTT is very similar to FSB but works in conjunction with the LDT multiplier. When the LDT frequency approaches 1000Mhz the system can lose stability. Oftentimes lowering the LDT multiplier will solve this issue and allow the higher overclock. The strange part is that changing the LDT frequency has no noticeable effect on system performance aside from overclocking.
The rest of the BIOS screens show the various voltage adjustments and frequency clocks used to tune the Chaintech VNF4 Ultra. (BIOS version 3.0 (3/15/2005))
One cool feature of the latest BIOS is a low level thermal fan controller that runs off of the CPU and motherboard thermal diodes. Currently there are only two fan headers that are thermally controlled and we've marked them with yellow circles.
The neat thing is, since the speed is controlled at the bios level they respond to the slightest amount of thermal variance. For instance running a Sandra CPU benchmark will increase the fan speed based on the thermal delta and then drop when the temperature drops. This might actually be one of the coolest and most functional cooling features we've ever seen, and there are a bunch. 
