[geeks] Of video cards and power supplies...

[Sridhar Ayengar]

Jonathan Groll wrote:
>> In my experience thus far, the Antec Signature 650 has not demonstrated
>> any squealing with the GTX 280, and I wouldn't be surprised if other high
>> quality DC-DC designs such as the Enermax Revolution and Seasonic M12D
>> also cope well with badly-designed cards such as the NVIDIA GTX 280.
> 
> Hi Nate,
> 
> What am I missing here? From the "hardwaresecrets" review of the "Antec
> Signature 650" it seems that this PSU accepts 110V AC as input (and
> has a rectifying bridge), so in what way then is it a DC-DC power
> supply?

Because, instead of generating 5V and 3.3V from mains voltage, it 
generates them from the 12V rail with an embedded DC-DC power supply.  I 
think the argument is that the supplies that generate the squeal 
generate 5V and 3.3V straight from mains voltage.

Peace...  Sridhar