PSU for crossfire

[MaxZeta]

Hello everyone.

So the thing is, I'm building a mid range rig and I bought an RX 470 4gb. I couldn't buy any GTX because of budget and the RX fitted my needs enough.

Nevertheless, I also was thinking that in the future (like some years from now on) when the gaming market demands more GPU juice, maybe I could Crossfire with another RX 470 (which would be a lot cheaper than it is now) and maybe get a bit on pair for the future gaming and squeeze a few more years to this rig (something a gtx 1060 wouldn't allow me)

So, the thing is, How much PSU power do I need? (I will get a Seasonic, since they are the most available where I am and at a decent price)

Also note:

CPU will be an i5 6500/6600 non k (yes, the 6500 is enough but I saw some promotions a few months ago, so if opportunity arises, i will go with that 6600, but also, there was a 6600k promotion, if it's available I will get it, although it's not a must for me).

RAM: kingston or g.skill 8gb 2400mhz (or 16gb, again, if promotions are available)

SSD: anything cheap with a good reputation and 500gb.



So, how many watts do I need for crossfire? And what about crossfire with a mild OC of a 6600k in case I get it? Would 1.21 gigawatts be enough?

Thanks for your help!

 

[Ali Tauseef]

About 900 watts will do.

 

[ragnarok94]

I highly recommend the EVGA SuperNOVA 750B2 bronze
it's 80%+ bronze rated, semi-modular, and outfitted for SLI/Crossfire
and you can run just about anything up to about 680W
plus it's a great bang for buck PSU @ $85
https://goo.gl/T55p15

Also comes with extra cables for anything you need

 

[elbert]

I suggest the seasonic M12II 750W. You need atleast 2X 6+2 PCI-E power connectors. Some of the rx470's use 8pin power thus this is your best option. currently on sale for $90 and has a low 8% low rating so your less likely to get a bad part.
http://www.newegg.com/Product/Product.aspx?Item=N82E16817151107

 

[MaxZeta]

I was thinking something around Seasonic S12II-620 620W 80+ Bronze Power Supply (SEA-S12II-620).

So 620Watts, but you guys are talking about 750 to 900 :/

Is Seasonic lying to me with this PSU?

 

[ragnarok94]

I was thinking something around Seasonic S12II-620 620W 80+ Bronze Power Supply (SEA-S12II-620).

So 620Watts, but you guys are talking about 750 to 900 :/

Is Seasonic lying to me with this PSU?

I can't really say much on that particular model, but seasonic is known for generally having the best PSU's. If you're wanting future ready though, definitely get the most reliability and power for your dollar. The B2 I mentioned, I personally use to power a 6-core 3rd gen i-7, an MSI military class motherboard and a zotac GTX 980. barely breaks a sweat.

based on your system description, I made a list to see what wattage you'd be running at (assuming you don't plan on optical drives or other hard drives outisde of the SSD) and it should't be drawing over 450 watts. THus, you should be fine with anyhting rated 80% + 550 Watt or more. Personally I wouldn't go less than 750, just in case you decide to upgrade to more powerful cards, etc.

here's the test list
http://pcpartpicker.com/list/Dv4HWX

 

[elbert]

I was thinking something around Seasonic S12II-620 620W 80+ Bronze Power Supply (SEA-S12II-620).

So 620Watts, but you guys are talking about 750 to 900 :/

Is Seasonic lying to me with this PSU?

It should have enough power but it only has a single 6+2 and a single 6 pin PCI-E power plug. This means you may be limited in choice. Not only does the 470 come in 8 pin power but the 480 will also crossfire with the 470. As long as you understand the limit the 620W should handle 2 X 470's with 6 pin power none overclocked versions. Overclocked versions may be to much for the power supply plus again they are more out to have the 8 pin power.

 

[MaxZeta]

I was thinking something around Seasonic S12II-620 620W 80+ Bronze Power Supply (SEA-S12II-620).

So 620Watts, but you guys are talking about 750 to 900 :/

Is Seasonic lying to me with this PSU?

It should have enough power but it only has a single 6+2 and a single 6 pin PCI-E power plug. This means you may be limited in choice. Not only does the 470 come in 8 pin power but the 480 will also crossfire with the 470. As long as you understand the limit the 620W should handle 2 X 470's with 6 pin power none overclocked versions. Overclocked versions may be to much for the power supply plus again they are more out to have the 8 pin power.

Man, a few hours ago I realized that...sheeet. I saw the x2 PCIe pins and I asumed they were 8 pin. boy was I wrong!

Nevertheless, I found some PSU that seem interesting and they are all around the same price (10 bucks more or less)

They are:

- Cooler Master G650M 650W (may pick this one)
- Antec VPF650 EC 650W
- High Power Astro Lite 750W 80Plus Gold HPM-750GD-F14C (some doubts about this one, but it does appear in the tier list of tomshardware

All of them have x2 8 pins connectors and are more than enough for pumping some juice.

Thoughts?

 

[elbert]

I was thinking something around Seasonic S12II-620 620W 80+ Bronze Power Supply (SEA-S12II-620).

So 620Watts, but you guys are talking about 750 to 900 :/

Is Seasonic lying to me with this PSU?

It should have enough power but it only has a single 6+2 and a single 6 pin PCI-E power plug. This means you may be limited in choice. Not only does the 470 come in 8 pin power but the 480 will also crossfire with the 470. As long as you understand the limit the 620W should handle 2 X 470's with 6 pin power none overclocked versions. Overclocked versions may be to much for the power supply plus again they are more out to have the 8 pin power.

Man, a few hours ago I realized that...sheeet. I saw the x2 PCIe pins and I asumed they were 8 pin. boy was I wrong!

Nevertheless, I found some PSU that seem interesting and they are all around the same price (10 bucks more or less)

They are:

- Cooler Master G650M 650W (may pick this one)
- Antec VPF650 EC 650W
- High Power Astro Lite 750W 80Plus Gold HPM-750GD-F14C (some doubts about this one, but it does appear in the tier list of tomshardware

All of them have x2 8 pins connectors and are more than enough for pumping some juice.

Thoughts?

I only suggest Seasonic, Antec, and Corsair. The Antec 650W would be fine. Most all the rest over rate their power output but seasonic and Antec can always produce about 100w abover their rating. The Corsairs output their rating.

 

[MaxZeta]

I was thinking something around Seasonic S12II-620 620W 80+ Bronze Power Supply (SEA-S12II-620).

So 620Watts, but you guys are talking about 750 to 900 :/

Is Seasonic lying to me with this PSU?

It should have enough power but it only has a single 6+2 and a single 6 pin PCI-E power plug. This means you may be limited in choice. Not only does the 470 come in 8 pin power but the 480 will also crossfire with the 470. As long as you understand the limit the 620W should handle 2 X 470's with 6 pin power none overclocked versions. Overclocked versions may be to much for the power supply plus again they are more out to have the 8 pin power.

Man, a few hours ago I realized that...sheeet. I saw the x2 PCIe pins and I asumed they were 8 pin. boy was I wrong!

Nevertheless, I found some PSU that seem interesting and they are all around the same price (10 bucks more or less)

They are:

- Cooler Master G650M 650W (may pick this one)
- Antec VPF650 EC 650W
- High Power Astro Lite 750W 80Plus Gold HPM-750GD-F14C (some doubts about this one, but it does appear in the tier list of tomshardware

All of them have x2 8 pins connectors and are more than enough for pumping some juice.

Thoughts?

I only suggest Seasonic, Antec, and Corsair. The Antec 650W would be fine. Most all the rest over rate their power output but seasonic and Antec can always produce about 100w abover their rating. The Corsairs output their rating.

Actually I jus found the Seasonic M12II-620 Evo 620W. It's newer, it's better and it's on the same price as those. So I'm going with that and thank God it has x2 8 pins.

Thanks for all the help guys!