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X-850 not enough?

A

aznpotpie

[H]ard|Gawd
Joined
Dec 14, 2006
Messages
1,270
First my specs were the following:
2600k @ 5ghz (1.5v)
2x 6970 @ 950/1375 (roughly 9% for the power slider)
P8P67 Deluxe
A MCP655 pump
So when I was testing this system out with 3DMark 11 or Vantage the entire system would shut down during the test. Sounds like not enough juice doesn't it? Seems weird since I thought 850 would be enough.
 
850 is definitely enough. Either you have a defective power supply (which does happen even to the best of PSU's), or one of your other hardware components are defective. Or you're potentially overheating the system. I would remove one of the 6970's and see what happens. If it runs fine, swap it with the other one. If both run fine, then you may have a bad PSU.
 
Tsumi said:
850 is definitely enough. Either you have a defective power supply (which does happen even to the best of PSU's), or one of your other hardware components are defective. Or you're potentially overheating the system. I would remove one of the 6970's and see what happens. If it runs fine, swap it with the other one. If both run fine, then you may have a bad PSU.
Click to expand...

Both run fine independently. Here is the kicker, I have never done a full load of CPU and GPU together but I have done it independently. I have ran LinX for 48 hours without issue then I ran the bitcoin mining so that the GPU get full load for a week. Nothing wrong then. In 3DMark06 it works perfectly fine also.
 
How about OCCT Power Supply test? That will simultaneously load up the CPU and GPU's.
 
You'll come close to reaching 850W continuous load. My rig draws about 850W (DC load, not wall) when running OCCT PSU test. My GPU's are at 1015MHz at 1.28V.
 
FaRKle0079 said:
You'll come close to reaching 850W continuous load. My rig draws about 850W (DC load, not wall) when running OCCT PSU test. My GPU's are at 1015MHz at 1.28V.
Click to expand...

I'm wondering if I'm am going beyond 850w limit because when I was doing mining for a week, both of my GPU and the cpu on idle was about 660 watts according to my kill a watt. Adding that and my 2600k at 1.5v would it be at that the 850w line? Also how reliable is the reading on the kill a watt units?
 
660 watts at wall, 90% efficiency is 600 watts pulled from the power supply. Sandy Bridge overclocked hardly ever exceeds 200 watts pulled from the power supply, and in most cases will not use over 150 watts, depending on the application used. That puts you at most around 800 watts pulled from the power supply.

Run the OCCT Power Supply test and see if it shuts down on you. Also, are you checking your temps and making sure they're not excessively high?
 
aznpotpie said:
I'm wondering if I'm am going beyond 850w limit because when I was doing mining for a week, both of my GPU and the cpu on idle was about 660 watts according to my kill a watt. Adding that and my 2600k at 1.5v would it be at that the 850w line? Also how reliable is the reading on the kill a watt units?
Click to expand...
Your PC may pull 660W from the wall when it's mining, but that's not idle power consumption. 850W is more than enough for your needs.
 
I'm wondering if I'm am going beyond 850w limit because when I was doing mining for a week, both of my GPU and the cpu on idle was about 660 watts according to my kill a watt. Adding that and my 2600k at 1.5v would it be at that the 850w line? Also how reliable is the reading on the kill a watt units?
Click to expand...

My rig draws about 710-730W doing mining on just my GPUs (CPU mining is pointless). My CPU definitely uses more power than yours, so your rig shouldn't be pulling more than mine does when running OCCT PSU test.

Also your statement about idle drawing 660W AC from wall doesn't make sense unless you messed up your powerplay configuration so you're running full clocks on your GPUs all the time. My rig doesn't draw more than 260W (DC) idle.
 
I had the same issue with a Seasonic S12-850w and 2x5870, two of them in a row to be exact. Even posted about it here. Seasonic told me if I had bought the X-850 I wouldn't have had any issues. Sure...

Seasonic did offer me an RMA but I couldn't be bothered with getting another S12-850 that would probably have the same issue. My solution was to buy a Mushkin 1000w that I got on sale for $99.00. I run it in combined mode instead of split +12v rails. Haven't had a problem since.
 
Zero82z said:
Your PC may pull 660W from the wall when it's mining, but that's not idle power consumption. 850W is more than enough for your needs.
Click to expand...
Well we will find out later tonight when I get home from school and test it out. I just did a small calculation using this and it seems I may be going over the 850w with all my general info inputed and at max load.

FaRKle0079 said:
My rig draws about 710-730W doing mining on just my GPUs (CPU mining is pointless). My CPU definitely uses more power than yours, so your rig shouldn't be pulling more than mine does when running OCCT PSU test.

Also your statement about idle drawing 660W AC from wall doesn't make sense unless you messed up your powerplay configuration so you're running full clocks on your GPUs all the time. My rig doesn't draw more than 260W (DC) idle.
Click to expand...
I may have been unclear here. I said that the rig was consuming approximately 660 watts when I was mining with both the 6970 at full load and the 2600k at idle.. What I'm very interested in knowing is how much a 2600k consumes when it is at 1.5v. Never thought the CPU could make or break the difference and I'll find out tonight when I run the CPU at stock.

Gnasher said:
I had the same issue with a Seasonic S12-850w and 2x5870, two of them in a row to be exact. Even posted about it here. Seasonic told me if I had bought the X-850 I wouldn't have had any issues. Sure...

Seasonic did offer me an RMA but I couldn't be bothered with getting another S12-850 that would probably have the same issue. My solution was to buy a Mushkin 1000w that I got on sale for $99.00. I run it in combined mode instead of split +12v rails. Haven't had a problem since.
Click to expand...
That is very weird. My previous system before this was a i7-920@ 4ghz and 2x 5870. Now that was using a Seasonic X-750 which had no issues at all.
 
aznpotpie said:
Well we will find out later tonight when I get home from school and test it out. I just did a small calculation using this and it seems I may be going over the 850w with all my general info inputed and at max load.
Click to expand...
That calculator is not accurate at all.
 
PSU calculators are never accurate, and should never be used for estimating power. The only thing they're good for is how much power a crappy power supply is marketed at needs in order to power your system. And, of course, crappy power supplies for the most part probably only output about 75% of their rated output. And crappy power supplies do not have all the power available on the 12v rail, i.e. a crappy 900 watt power supply may only have 750 watts on the 12v rail, while the newer 850 watt power supplies have 840 watts on the 12v rail, which is the important rail when it comes to CPU and GPU.
 
its more than enough. I see you're watercooling. Do you have active cooling over the mosfets/NB/SB? my rig would shutdown under F@H load, turns out my mosfets were schorcing hot. a 120mm fan aimed at those above components solved all my stability problems
 
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