will my 400 watt psu work well with a hd 5670

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Xeone

Xeone

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Jun 14, 2014
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okay so im intending to buy an amd radeon hd 5670 1gb card and ive got an intex 400watt psu. and i want to know if the card will run perfectly? i cant take the risk of blowing my pc haha
so heres my system:
processor: intel core 2 duo E7500 2.93GHz
Motherboard: Asrock g31ms
Ram: kingston 2x2gb
and for the psu i couldnt find it on the internet so heres the specs of it

power supply intex expert IT-20F1BC
400 watt, 20+4 pin, 1 sata, 3 hdd, 1 fdd,1 fan
AC input: 220v 50Hz 5A
DC output: =3.3v:25A +5V:28A +12V:15A
-12V:0.5A +5VSB:2A
 
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joex444

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Feb 16, 2006
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Here's the deal with PSUs and wattage: they have 3 different DC output voltages, 3.3V, 5V, and 12V. The 3.3V and 5V lines are used for low wattage things - for example, the 3.3V line was commonly used for floppy drives and is now an optional pin on SATA connectors. The 5V line looks like a perfect way to supply the USB ports with their 5V power connection. These both get used by the motherboard's 24 pin ATX plug as well.

But the real meat is the 12V line. This is what the 8 pin EPS connector has in it (12V and ground), as well as the 6 and 8 pin PCIe connectors (notice they're usually yellow and black wires?). For a high end PSU, let's look at the Corsair RM1000X. It has:

+3.3V: 25A
+5V: 25A
+12V: 83.3A

Since power is just current times voltage, we also see this is

+3.3V: 82.5W
+5V: 125W
+12V: 1000W

And the PSU adds a couple extra labels to indicate the peaks. First, it says that the +3.3V and +5V lines should not run more than 150W total, and the entire PSU should not run more than 1000W total. But if you sum this all up, it's apparently capable of 1200W.

Now let's look at the Intex you have.

+3.3V: 25A = 82.5W
+5V: 28A = 140W
+12V: 15A = 180W

In this case we see the 400W is derived by summing all of this together, whereas with the high end PSU the wattage was rated for what the +12V rail alone could provide. By that metric, this is a 180W PSU, treat it like one.
 
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J

joex444

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Feb 16, 2006
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As for which PSUs are compatible with your motherboard... you have a 24 pin ATX connector and a 4 pin EPS connector. Most systems use 8 pin EPS, so you'll want to find a PSU that has a 24-pin (or 20+4) ATX connector and a 4+4 pin EPS connector. However don't worry too much about finding a 4+4 versus an 8-pin, because it looks like your board has enough room for the other 4 pins to hang. The first 4 pins of the 8-pin connector are what you want, so here you'd simply connect half of the 8 pin connector and that'll work.

It doesn't make sense to go for a PSU that only has a 4 pin EPS connector since that won't work correctly with new boards that'll have the 8 pin connector once you make the upgrade.
 
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