Akasa 750w venom for Haswell

apeksdiver · 20 Jun 2013 at 20:34

I have an Akasa venom psu, it is not in the list of Haswell approved power supplies. Has anyone got one in their Haswell system? Should I look for another psu or just disable the low power stuff.

UnworthyBean · 20 Jun 2013 at 20:37

There is no such thing as a PSU that will only work on Haswell, or any other platform (Sandybridge) for that matter. They all use the same connectors and pump out the same flavour of electricity.

You'll be fine

Surveyor · 20 Jun 2013 at 20:52

UnworthyBean said:
There is no such thing as a PSU that will only work on Haswell, or any other platform (Sandybridge) for that matter. They all use the same connectors and pump out the same flavour of electricity.

You'll be fine

Haswell processors feature a new sleep state that isn't compatible with all power supplies. Haswell's sleep power draw is substantially lower than that of previous generations, and it can trigger some PSUs' under-voltage protection and force a system reset.

According to Intel's presentation at IDF, the new Haswell processors enter a sleep state called C7 that can drop processor power usage as low as 0.05A. Even if the sleeping CPU is the only load on the +12V rail, most power supplies can handle a load this low. The potential problem comes up when there is still a substantial load on the power supply's non-primary rails (the +3.3V and +5V). If the load on these non-primary rails are above a certain threshold (which varies by PSU), the +12V can go out of spec (voltages greater than +12.6V). If the +12V is out of spec when the motherboard comes out of the sleep state, the PSU's protection may prevent the PSU from running and will cause the power supply to "latch off". This will require the user to cycle the power on their power supply using the power switch on the back of the unit.

Not all power supplies support the very low power draw.

They should all work with Haswell but some may require the new low-power power state to be disabled as noted by the OP.

MonsterMoshi · 20 Jun 2013 at 22:03

Almost all single rail power supplies will work just fine

apeksdiver · 20 Jun 2013 at 22:21

Guess there will only be one way to find out

BlackBat · 20 Jun 2013 at 23:05

IMO try it, if it works okay then you don't need another PSU, if it doesn't then disable the new low power state as you still don't need another PSU. How long would you need to use the new low power state to justify spending £XX.XX on a new PSU anyway?

apeksdiver · 10 Jul 2013 at 11:44

Just a quick update for anyone who wants to use this with a haswell build, it works perfectly even with the low power state stuff enabled.

oldestgregg · 10 Jul 2013 at 11:46

UnworthyBean said:
There is no such thing as a PSU that will only work on Haswell, or any other platform (Sandybridge) for that matter. They all use the same connectors and pump out the same flavour of electricity.

You'll be fine

Some PSU's are not compatable with Haswells new ultra low power state. I think thats what he meant.