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PSU for HD 7850

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July 17, 2012 1:26:49 PM

I recently got a I5 - 3450 and a MSI TF 7850.

Yet to buy the other parts..

And was wondering if a SeaSonic S12II 430 430W ATX12V V2.3/EPS12V 80 PLUS BRONZE
would be enough for the rig, or should i get a SeaSonic S12II 520 Bronze 520W ATX12V V2.3 / EPS 12V V2.91 80 PLUS BRONZE .

Thanks for ur help :) 

More about : psu 7850

a b U Graphics card
July 17, 2012 5:06:54 PM

go for 600-650w
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a b U Graphics card
July 17, 2012 5:10:10 PM

for a single 7850,430w will do fine.
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July 17, 2012 5:13:29 PM

yeah a single 7850. not planning to CF . just gonna run one card.. 2 HDDs, maybe SSD after 4 months..
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a b U Graphics card
July 17, 2012 5:15:44 PM

yes a 430w is enough.
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a b U Graphics card
July 17, 2012 5:24:15 PM

yes seasonic 430w is sufficient.
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July 17, 2012 5:30:59 PM

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a c 191 U Graphics card
July 17, 2012 5:46:18 PM

The 430W Seasonic should suffice just fine.

Quote:
AMD Recommends a 500W or greater PSU.
http://www.amd.com/us/products/des [...] 850.aspx#2


AMD overrates how much power the card needs. They want to cover everyone who has a 500W power supply. Basically, by them saying 500W, a larger range of 500W's will work with the card. A good 400-450W should run it fine.
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July 17, 2012 5:52:14 PM

thats a 600w unit u suggested.. but as per anandtech bench a 7850 PC requires only as much as 300 watt or so.. so 430w is good right.. even if i OC the card.. im planning to get the 430w Bronze seasonic unit
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a b U Graphics card
July 17, 2012 5:52:20 PM

The 600W is a much better choice. More headroom for upgrades and a minimal cost difference to the 430W.
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a c 191 U Graphics card
July 17, 2012 5:56:19 PM

stant1rm said:
The 600W is a much better choice. More headroom for upgrades and a minimal cost difference to the 430W.


You don't need 600W for a 7850, and considering that he is getting a 7850 now, he probably wont upgrade the PSU again until he gets a new card, which will probably be awhile considering the speed of the 7850.
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a b U Graphics card
July 17, 2012 6:02:02 PM

hellfire24 said:
yes seasonic 430w is sufficient.


^+1

It's a shame tom's doesn't have a comment rating system yet. It'd help folks discern good info from bad so much more easily. You don't need a 500 or 600w PSU at all, and lol at the comment that seems to be calling a seasonic PSU "skimping". Not only is the PSU hellfire recommended sufficient, you have room for expansion.
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a b U Graphics card
July 17, 2012 6:07:48 PM

Those who say the 430w is sufficient are correct. The 7850 sips power. Even if you were to flash a different BIOS to it and overvolt/overclock it all the way, you wouldn't be pushing the Seasonic 430w anywhere close to its limit.
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a b U Graphics card
July 17, 2012 6:14:14 PM



Stop it. Please. I apologize for picking on you, but you need to learn a lot more about PSU's. You're giving out bad information. Here's a freebie.

Corsair isn't a PSU manufacturer, they're a rebrander. The CX series is made by CWT, which is a mediocre (at best) manufacturer of PSU's. The builder series are budget PSU's with budget components. Seasonic is arguably the best PSU manufacturer right now. Several other companies flagship PSU's including Corsair's are actually made by Seasonic.

http://www.overclock.net/t/837679/psa-the-corsair-cx-se...
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July 17, 2012 6:55:05 PM

ok guys then im getting the 430 watt seasonic. thanks :-) i hope it will be sufficient even if i OC :) 
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July 17, 2012 7:13:26 PM

hmm okay.. I'll get that..

edit : actually i thought i would have breathing room with the 430w itself
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a c 106 U Graphics card
July 17, 2012 7:19:34 PM

anirudh1 said:
hmm okay.. I'll get that..

edit : actually i thought i would have breathing room with the 430w itself



for a single card build, the ~500 mark is the breathing room for other addon on marks besides another gpu.
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a c 271 U Graphics card
July 17, 2012 7:21:26 PM

quilciri said:
Stop it. Please. I apologize for picking on you, but you need to learn a lot more about PSU's. You're giving out bad information. Here's a freebie.

Corsair isn't a PSU manufacturer, they're a rebrander. The CX series is made by CWT, which is a mediocre (at best) manufacturer of PSU's. The builder series are budget PSU's with budget components. Seasonic is arguably the best PSU manufacturer right now. Several other companies flagship PSU's including Corsair's are actually made by Seasonic.

http://www.overclock.net/t/837679/psa-the-corsair-cx-se...


Not quite true, they commission Seasonic to make PSU's for them to the specs they give which is not the same as slapping your own sticker on somebody else's product.
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July 17, 2012 7:30:09 PM

so finally 430w or 520w ?
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a c 185 U Graphics card
July 17, 2012 7:33:38 PM

anirudh1 said:
so finally 430w or 520w ?
520w i mean seriously why not ? :lol: 
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a c 185 U Graphics card
July 17, 2012 7:36:52 PM

dudewitbow said:
for a single card build, the ~500 mark is the breathing room for other addon on marks besides another gpu.
+1 exactly :) 
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July 17, 2012 7:37:47 PM

i have a very low budget and im trying to save as much as possible.. the savings between 430w and 520w can be the diff between a mATX and ATX motherboard. thats why im asking..
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a c 185 U Graphics card
July 17, 2012 7:43:32 PM

anirudh1 said:
i have a very low budget and im trying to save as much as possible.. the savings between 430w and 520w can be the diff between a mATX and ATX motherboard. thats why im asking..
So save a little more money that's what i would do :)  but if you want to get the 430W go ahead it's sufficient
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July 17, 2012 7:55:20 PM

430w will be good even if i run multiple hard drives and SSD right ?
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July 17, 2012 8:24:50 PM

I'm a noob. I'll not argue the virtues of the 430 vs 520. Seasonic is a great brand. I would get the 520w (between the two). The 430 will work just fine - the 520 may give you more options in the future.

Both are $70 (after shipping) at newegg right now.

I would consider (and bought) a PC Power and Cooling Mk III 600w 80+ bronze - modular.
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a c 106 U Graphics card
July 17, 2012 8:26:31 PM

odiervr said:
I'm a noob. I'll not argue the virtues of the 430 vs 520. Seasonic is a great brand. I would get the 520w (between the two). The 430 will work just fine - the 520 may give you more options in the future.

Both are $70 (after shipping) at newegg right now.

I would consider (and bought) a PC Power and Cooling Mk III 600w 80+ bronze - modular.



hes not form the us. earlier posts point ot theitware online store, which is an indian computer part store.
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a c 291 U Graphics card
July 17, 2012 8:32:54 PM

I'd get the 430 watt unit now, ATX motherboard is much better thing to have over mATX than a bit higher wattage seasonic unit, especially since the 430 watt is more than enough.
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a b U Graphics card
July 17, 2012 8:38:34 PM

anirudh1 said:
thats a 600w unit u suggested.. but as per anandtech bench a 7850 PC requires only as much as 300 watt or so..

And those 300W would be wall-measured watts. Assuming 90% efficiency, the actual system power would be closer to 270W.
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a c 185 U Graphics card
July 17, 2012 8:52:27 PM

anirudh1 said:
430w will be good even if i run multiple hard drives and SSD right ?
of course i wouldn't OC the 7850 to hard though :D 
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July 17, 2012 8:56:43 PM

i'm on an 860 and a 7850 twin frozr, i have a 600W psu so i'm guessing that should be more than enough. max power draw is 150W so with a 3450 i don't think you'll have problems unless you have any intention of overclocking
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a c 185 U Graphics card
July 17, 2012 9:14:29 PM

The OC factor is what concerns me. I have no doubt that a non-OC 7850 with two or three hard drives and a SSD is fine on 430W, but if you care to try for a max OC, I personally wouldn't be comfortable with it.
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July 17, 2012 9:28:27 PM

And yes, Im Indian :-)

Anyone has a 7850 OC'd running in a 430watt unit ?
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a c 185 U Graphics card
July 17, 2012 9:32:09 PM

anirudh1 said:
And yes, Im Indian :-)

Anyone has a 7850 OC'd running in a 430watt unit ?

It's understandable that you would be confused. There are issues: 1) People make claims without backing it up with proof, 2) People make blanket statements, when the reality is they don't know for sure unless they have the same setup as your planing.Your best bet is to always do your own research using the many review websites and don't always believe everything reported by random anonymous posters on a public forum. ;) 
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a b U Graphics card
July 17, 2012 10:22:37 PM

Mousemonkey said:
Not quite true, they commission Seasonic to make PSU's for them to the specs they give which is not the same as slapping your own sticker on somebody else's product.


Admittedly that's true for a lot of corsair PSU's, and I was being a little unfair to corsair, but some are still nothing more than rebrands - like the original CX400 was just a rebranded S12II.
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a b U Graphics card
July 17, 2012 10:23:20 PM

anirudh1 said:
i have a very low budget and im trying to save as much as possible.. the savings between 430w and 520w can be the diff between a mATX and ATX motherboard. thats why im asking..


What features would you miss from the full ATX board?
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a b U Graphics card
July 17, 2012 10:31:00 PM

InvalidError said:
And those 300W would be wall-measured watts. Assuming 90% efficiency, the actual system power would be closer to 270W.

+1
Then add in the fact that Anandtech got thier power consumption numbers while using an overclocked I7-3960x and the OP's system power consumption with an I5-3450 is going to be much lower than that 270 watt number
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July 18, 2012 4:56:55 AM

quilciri said:
What features would you miss from the full ATX board?


I heard that ATX board cools better. Thats why
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Best solution

a b U Graphics card
July 18, 2012 5:52:06 AM

bigcyco1 said:
It's understandable that you would be confused. There are issues: 1) People make claims without backing it up with proof, 2) People make blanket statements, when the reality is they don't know for sure unless they have the same setup as your planing.Your best bet is to always do your own research using the many review websites and don't always believe everything reported by random anonymous posters on a public forum. ;) 



Here they test power consumption of a 3820 system (much higher draw than a 3450) and overclocked 7850. With a single 7850 the whole system drew 271 watts. OC'ing increased the draw by 10w. I will grant you it was not an extreme overclock, but with a 430w psu that still leaves a lot of headroom. In SLI, the system drew 369 watts.

http://fudzilla.com/home/item/26587-xfx-black-dd-radeon...

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a c 185 U Graphics card
July 18, 2012 6:02:04 AM

Temile said:
Here they test power consumption of a 3820 system (much higher draw than a 3450) and overclocked 7850. With a single 7850 the whole system drew 271 watts. OC'ing increased the draw by 10w. I will grant you it was not an extreme overclock, but with a 430w psu that still leaves a lot of headroom. In SLI, the system drew 369 watts.

http://fudzilla.com/home/item/26587-xfx-black-dd-radeon...
That is up to the OP if he wants to trust that :) 
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a b U Graphics card
July 18, 2012 9:21:53 AM

final answer before this thread turns into something else,
seasonic 430w unit is enough for your system.
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a b U Graphics card
July 18, 2012 11:46:44 AM

anirudh1 said:
I heard that ATX board cools better. Thats why

micro-ATX has the exact same socket and slot layout as full-size ATX, only thing lost is the 3-4 extra expansion slots.
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a c 291 U Graphics card
July 18, 2012 1:36:55 PM

And RAM slots. And they tend to have worse chipsets.
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a b U Graphics card
July 18, 2012 2:21:49 PM

Sunius said:
And RAM slots. And they tend to have worse chipsets.

Almost every major manufacturer has at least one micro-ATX motherboard with z77 chipset with the usual four DIMM slots and about half of those can do x8x8 crossfire/SLI so there is a micro-ATX board for just about anyone who bothers looking. We aren't 5-10 years ago where it was nearly impossible to find mATX boards with anything other than low-end chipsets with IGP. h77 is not really "low-end" either, only things lost with it are SLI/crossfire and overclocking which the vast majority of PC buyers are not going to bother with either.

The main problem with micro-ATX is that people who should be buying micro-ATX boards since they will never use any of the extra IOs on full-sized boards still buy full-sized boards anyhow out of habbit so offer/demand on mATX boards is nowhere near as high as it should/could be and mATX prices end up almost on par with ATX counterparts so people end up buying ATX instead of mATX which perpetuates the problem.
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a c 291 U Graphics card
July 18, 2012 2:24:59 PM

...and those boards aren't cheaper. The OP in order to get beefier power supply will have to get a cheap mATX board, which means it will have only 2 RAM slots and worse chipset.
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a b U Graphics card
July 18, 2012 2:52:38 PM

Sunius said:
...and those boards aren't cheaper. The OP in order to get beefier power supply will have to get a cheap mATX board, which means it will have only 2 RAM slots and worse chipset.

Since the OP says he was going "very budget" build, it is unlikely he is going to go SLI/CFX and since he already has an i5-3450, overclocking is impossible so the h77 chipset would be every bit as good as z77 at this point since both of the z77's advantages over h77 are forfeit anyhow.

As far as DIMM slots go, go to NewEgg, go to "More" search parameters, select LGA1155 and micro-ATX, search, open the "More" menu again, select Number of DIMM slots and you will see that the number of LGA1155 mATX boards with four DIMM slots is larger than the number of mATX boards with only two slots. When I tried this a few minutes ago, I saw 41 quad-DIMM models vs 33 dual-DIMM so the majority of mATX motherboards (on NewEgg) support full DIMM complement, no sacrifice from going mATX there unless you specifically make that choice.
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