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Will C2D E7600 bottleneck 2x5770? - Page 2

post #11 of 25
bottleneck: doesnt matter cause your powersupply wont survive

PSU: no.

from the link you provided

Quote:
Maximum combined load on 12V1+12V2+12V3 outputs shall not exceed 440W
voltage reulation +/- 5%, ripple 70-120mv is also the spec, but its not good for a psu to be in this range


the rail distribution of the 12v power is rediculous. its one of the worst distributions ive seen. the voltage regulations is +-5%, which is just ATX spec, but its terrible for a PSU to actually run at that. and the peak-to-peak ripple is also horrible.

i wouldnt trust this thing to hold down my paper (weight = quality so i would assume it would blow away in the wind it should be protecting my papers from)

a quality 560w like the Seasonic X-560, you would be set for CFX 5770s
Edited by IntelConvert - 2/24/11 at 2:32pm
    
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post #12 of 25
Here in the UK a 6970 is around £280.

A am3 crossfire mb is about £100, 6 core £150 and a 5770 £100 = £350, you already have ddr3.
You could easily make the £70 from selling your old mobo and cpu.
But these are very rough estimates.
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post #13 of 25
Thread Starter 
Quote:
Originally Posted by IntelConvert View Post
i wouldnt trust this thing to hold down my paper (weight = quality so i would assume it would blow away in the wind it should be protecting my papers from)
Well actually it's quite heavy, and as far as I know it's a Sirtec brand which is not bad. Everything from box to cables and case feels really good quality.
Although it can still be bad on power-level.
The only review I've found about it is here.
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post #14 of 25
Quote:
Originally Posted by Nixuz View Post
A lot of people will say to go for the single 6970 and CF it later. Problem is, they said the same thing with the 5770 when that was new. Whenever the 7000 series comes out, they will tell current 6900 series owners to sell their single card and get a 7000 that they can crossfire later.

A 6970 isn't a giant leap over a 5870, and the 5770CF comes really close to a 5870.
this is my problem as well.
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post #15 of 25
Quote:
Originally Posted by IntelConvert View Post
bottleneck: doesnt matter cause your powersupply wont survive

PSU: no.

from the link you provided



the rail distribution of the 12v power is rediculous. its one of the worst distributions ive seen.

the voltage regulations is +-5%, which is just ATX spec, but its terrible for a PSU to actually run at that.

and the peak-to-peak ripple is also horrible.

i wouldnt trust this thing to hold down my paper (weight = quality so i would assume it would blow away in the wind it should be protecting my papers from)

a quality 560w like the Seasonic X-560, you would be set for CFX 5770s
I can't speak for voltage reg, ripple, or any thing relating to how "quality" that unit is, but wattage isn't the issue. A C2D and 5770 Xfire will not use anywhere close to 400 watts.

http://www.tomshardware.com/reviews/...0,2446-15.html with an i5, 2 5770s draw 324 watts from the wall.

To the gentleman on the first page saying a 550 watt PSU had trouble with a 5770, must be your PSU. A quality 400 watt unit can handle them no problem.

Nixus, rjajmr0221, that's why you buy what -you- want and can afford. If I listened to the crowd I would have bought a 560, to SLI later. But I got what I needed now, and it's far better than one 560.
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post #16 of 25
Thread Starter 
Quote:
Originally Posted by andypc View Post
Here in the UK a 6970 is around £280.
Yes, but I was talking about buying an 6950 and then flashing it to 6970.
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post #17 of 25
Quote:
Originally Posted by pursuinginsanity View Post
with an i5, 2 5770s draw 324 watts from the wall.
I built a crossfire 5770 rig using a 520 Antec NEO Eco. The only reason I went with so much power is to get two PCI-e power connectors. 5770's hardly use any power at all.
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post #18 of 25
Quote:
Originally Posted by pursuinginsanity View Post
I can't speak for voltage reg, ripple, or any thing relating to how "quality" that unit is, but wattage isn't the issue. A C2D and 5770 Xfire will not use anywhere close to 400 watts.

http://www.tomshardware.com/reviews/...0,2446-15.html with an i5, 2 5770s draw 324 watts from the wall.

To the gentleman on the first page saying a 550 watt PSU had trouble with a 5770, must be your PSU. A quality 400 watt unit can handle them no problem.

Nixus, rjajmr0221, that's why you buy what -you- want and can afford. If I listened to the crowd I would have bought a 560, to SLI later. But I got what I needed now, and it's far better than one 560.
yes, but this unit may not actually be able to put out the 440watts it claims to be capable of on the 12v rail, let alone its 560w total capacity, which is probably a peak rating, not a continuous output. it may also not be able to stay in spec when delivering its rated wattages.

Quote:
To the gentleman on the first page saying a 550 watt PSU had trouble with a 5770, must be your PSU.
my coolermaster 500w wouldnt handle one 5770 OC'd in Furmark and atleast there are reviews

Quote:
with an i5, 2 5770s draw 324 watts from the wall.
from Guru3d
Dual GPU 5770

System in IDLE = 249 Watts (= 21W added over single GPU)
System with GPU in FULL Stress = 423Watts

423w @ 80% efficiency ~ 340w, so yes it doenst pull a lot, but will it even be able to put that out? my old CM 500w was rated for 400+w on the 12v rail, but it couldnt dream of actually doing so.

that PSU might peak at that output but it wont be able to continuously sustain 360-400w 12V DC current (33A total) after overclocking. i just wouldnt trust my system to that PSU. i assume with 2 5770s you will be playing games like crysis warhead, metro, etc? these will put full load on the system.

that PSU is also not claiming any efficiency ratings of 80+Plus so it could have to pull more from the wall to get the DC power it needs, so you could see more degradation from the heat output due to the low efficiency. im assuming the reviewer had a PSU that could manage above 80%...

if youre lucky and you do 5770s with your E7600 it will bottleneck them enough to keep them from full load.

adding to long post after reading review:

that review used a Pentium D and an 8600GT and still had horrible voltage regulation. the full stress of that rig might have been 200w DC and they didnt do any loads with a load tester or a multimeter to see accurate voltages, they probably used software to measure the voltages, and thats not good.... the 3.3v and 5v rails are 3-4% off spec with only the load from the pentium D and the 8600gt. max is 5% to be inside ATX spec. its probably going out of spec from time to time with your 5770. with a second 5770, i wouldnt trust it

tl;dr: i wouldnt trust that psu
Edited by IntelConvert - 2/24/11 at 3:53pm
    
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post #19 of 25
Thread Starter 
Seeing a lot of reviews, I think the best price for performance now would be an X6 CPU+MB+another 5770.
If I go this way, what board would you advise me around 100$ for 1090T(probably OC'd to 4GHz) and crossfire?
I've searched around a bit, so which is the best one from these:
http://www.asrock.com/mb/overview.as...M3A790GXH/128M
http://www.msi.com/product/mb/870-G45.html#/?div=Basic
http://www.asrock.com/mb/overview.as...Specifications (It has the newest chipset, and USB3)
http://www.msi.com/product/mb/870U-G...l#/?div=Detail (The same chipset, a little more expensive, but 1090T is in the CPU Support list)
Edited by Xmister - 2/24/11 at 4:06pm
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post #20 of 25
all of those are 4+1 power phase boards, could limit your OC and some of the 4 phase MSI boards have been having issues with exploding/catching fire. you want a 6core CPU, 125w, probably OCd and stable? might need a better board, or be conservative on your OC.


where are you from (if you are outside the US, most retailers arent available, where can you order from?)
    
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