For ATX Form Factor with 12-volt connector power supplies.
12.1 Typical Power Distribution - RECOMMENDED
DC output power requirements and distributions will vary based on specific system
options and implementation.
Significant dependencies include the quantity and types of processors, memory, add-in
card slots, and peripheral bays, as well as support for advanced graphics or other
features. Figure 22 through Figure 26 shows the power distribution and cross loading
tables for power supplies in the range of 180 W to 450 W. These are recommendations
but it is ultimately the responsibility of the designer to define a power budget for a
given target product and market.
The ATX 2.31 specification states that the overvoltage protection sense circuitry and reference shall reside in packages that are separate and distinct from the regulator control circuitry and reference. So no single point fault shall be able to cause a sustained over voltage condition on any or all outputs.
DPete27 wrote:What rig are you using this PSU for?
- The AX has two 4+4 pin power connectors for rediculus overclocker boards like this whereas the HX only has one. (these are used to feed power to the CPU)
TheEmrys wrote:It looks like you are getting way more PSU than you need. Can you post up the comlete specs so we can find the best fit for you?
Chrispy_ wrote:The only thing you're doing that requires any real juice is the "new gpu or two". Unless you have a bazillion fans and drives, you can pretty much sum up your power needs as (CPU TDP + GPU TDPs)
Assuming you're planning on having capacity for 2xGTX680 or 2x7970, then you are right to be looking at around 750W. Even for two 200W+ GPUs, you don't need 750W but the headroom is useful for keeping your PSU running in it's most efficient load range and it'll be cooler/quieter if it's never working much beyond 50%. FYI, machines at 100% load and two high-end GPU's usually pull 450W from the wall, which means they are only being fed 400W from the PSU.
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