A short (ca.15 cm/6´) replacement for a HX 620

[dummnutzer]

I have been happily using HX620s for a few years, but I am afraid that my next gaming system might need more power. A HX850 would be fine, I suppose, but its length (18 cm/7+´) would require some modifications of an old case ... and I really like said case.

1. Are there any short (15 cm/6´) modular power supplies with more power than the HX620 on the market, that also offer a similar power quality/noise level?

2. I may very well be wrong about the HX620 not offering enough power, as I am no electrician.:o

I am going to build a

- I7 860 or I7 870 on a P55 main board with 8 GB RAM

or possibly a

- I7 920 on a X58 main board with 12 GB RAM

with a single (!) 5870, 3 HDs and the usual stuff. I want to have the power to do some medium overclocking when gaming.

Any comments about a HX620 being powerful enough to run such a moderate system? I just like having some reserves ...

[Lemmy]

It's more than enough. You can even do crossfire with that PSU, these new ATI cards are not that power hungry.

[HOOfan_1]

the HD5870 is pretty power hungry, but an HX620 is still more than enough.

[Zero82z]

the HD5870 is pretty power hungry, but an HX620 is still more than enough.
The 5870 consumes about the same amount of power as a 4890. It's not very power-hungry. The HX620 is absolutely powerful enough to handle one or even two of them.

[mdk777]

About every 5870 review has a total power use comparison.

Take your pick, here's a short synopsis:

Our test system is a power hungry Core i7 965 / X58 based and overclocked to 3.75 GHz. Next to that we have energy saving functions disabled for this motherboard and processor (to ensure consistent benchmark results).

Our ASUS motherboard also allows adding power phases for stability, which we enabled as well. I'd say on average we are using roughly 50 to 100 Watts more than a standard PC due to these settings and then add the CPU overclock, water-cooling, additional cold cathode lights etc.

Keep that in mind. Our normal system power consumption is much higher than your average system.

* System in IDLE = 169 Watts
* System with GPU in FULL Stress = 358 Watts

The monitoring device is reporting a maximum system wattage peak at roughly 350~400 Watts, and for a PC with this high-end card, this is simply low and certainly remains within acceptable levels.

http://www.guru3d.com/article/radeon-hd-5870-review-test/13

[dummnutzer]

Thanks for the input.

[cypherpunks]

System in IDLE = 169 Watts
System with GPU in FULL Stress = 358 Watts

The monitoring device is reporting a maximum system wattage peak at roughly 350~400 Watts.

And remember that's wall-plug power. Multiply by the PSU efficiency to get the system power to compare with your PSU rating.

358×0.85 = 304 W system power consumption.

Even doubling that because most PSUs are happiest around 50% of full load, a 650 W supply is still slightly more than you want for that system.

Another important factor is to keep idle usage above the 20% of full load mark where 80plus makes efficiency measurements. In this case, 169×0.85 = 143.6 W, so you want a PSU of no more than 5× that, or 718 W.