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THats what im saying, if your pushing your two 6990s like you should and you have a good system overclocking it, running strong, you want a 1k wall thermaltake at minimum, anything less is just going to die, no reason to push it, now if you run just the cards, basic system you can get away with it, but if your trying to keep it running 24/7 for awhile, then the thermaltake 1000 watt is the best option for the price. 15k are overkill but pretty expensive. RIGHT NOW THE Corsair HX1050 is out replacing the 1000 watt and is always a good choice.
Do not try to run two 6990s on a 850 watt PSU, it will fail, even a 1000k watt power supply it will cause issues for sure, unless you have a very low power rig in general for the rest of the rig. Its not just the two cards, but I have seen the ones I have built blow the thermaltake 1000watt power supplyes a couple of times already, its just a lot of stress on the PSU if you run it for mining 24/7 with the rest of the system and the heat. It can be done for sure, but your much better off having some room to play with. Definitely do not go lower then a 1000 watt PSU for mining with those cards.
Meh.
Two 6990 w/ underclocked memory plus low wattage mining system will draw <800W. If it blows a 1000W PS then the PS is junk unable to even delivery 80% of rated load before failure. That being said trying to put it on 850W supply is pushing it.
Of course a lot depends on the rest of build components. A 45W seprom makes it easier than an i7 quad core. I don't know why every miner doesn't have a kill-a-watt in order to better estimate their own loads.
Do not try to run two 6990s on a 850 watt PSU, it will fail, even a 1000k watt power supply it will cause issues for sure, unless you have a very low power rig in general for the rest of the rig. Its not just the two cards, but I have seen the ones I have built blow the thermaltake 1000watt power supplyes a couple of times already, its just a lot of stress on the PSU if you run it for mining 24/7 with the rest of the system and the heat. It can be done for sure, but your much better off having some room to play with. Definitely do not go lower then a 1000 watt PSU for mining with those cards.
So im running 2X6990 on a 1200w psu
I saw a bitcoin miner review on the web that claims the 6990 can draw up to 600w's on full load?
http://www.hardocp.com/article/2011/07/13/bitcoin_mining_gpu_performance_comparison/4
Anyone have any comment on that?
I saw a bitcoin miner review on the web that claims the 6990 can draw up to 600w's on full load?
http://www.hardocp.com/article/2011/07/13/bitcoin_mining_gpu_performance_comparison/4
Anyone have any comment on that?
They are saying a 6990 will draw 600W. It is an ENTIRE SYSTEM including a pair of 6990 and other ultra high end overclocked components will draw 1200W total at the wall.
The system in the review is beyond foolish. 8GB of ram ultra-overclocked i7 CPU, massive hard drive, etc. Even still it is 1200W @ the wall. So at 85% efficiency (a guess) that is ~1000 DC watts (power supplies are always rated in DC wattage, AC wattage will be higher due to PS inefficiency). How much of that 1K is due to the rest of system? Who knows. The review is kinda useless. If the system has 100% CPU bug and they didn't use affinity an overclocked i7 burning all cores @ 100% load can easily use 120W by itself.
If they wanted to do a real review they would record wattage of various cards on a usb linux key with no other components, measured at the wall, and they use power supply efficiency chart to figure actual DC load. Take the system at idle (or single core @ 100% for 100% CPU bug) to figure actual draw of cards.
I have a 1350W PSU running 3x6990 just fine.
what's the PSU efficiency and how many watts are you pulling from the wall?
Lol... I know, right! I kinda want one, but it would just tell me the same thing my electric bill tells me every month: "Your wife is going to kill you."
I have a 1350W PSU running 3x6990 just fine.
what's the PSU efficiency and how many watts are you pulling from the wall?It's an 80 Plus Gold rated supply (Enermax MaxRevo), so it should be pretty efficient. I wish I could tell you how much I'm really pulling, but I haven't bought a Kill-A-Watt yet.
I have a 1350W PSU running 3x6990 just fine.
what's the PSU efficiency and how many watts are you pulling from the wall?It's an 80 Plus Gold rated supply (Enermax MaxRevo), so it should be pretty efficient. I wish I could tell you how much I'm really pulling, but I haven't bought a Kill-A-Watt yet.
Off topic, but goodness 38 6970's must be loud. I have 3 of them that whine like hell compared to Sapphire xtreme cards.
They're actually not too bad... The box fans on the window are louder. I'm bringing cool air into the room from an evap cooler mounted in an adjacent room. 6 of the 6970's are reference cards and the other 32 have very good coolers (MSI 6970 Lightnings). The reference cards are running at 65% fan speed and the non-reference are on auto.[img]
Ok, I was imagining 38 reference 6970s at 90% fan speed or something. Nice setup
Im telling you from exeprience get a 1200 or 1500 watt good power supply. I have had tests and builds with all the newest cards and PSU and 1000 watt corsair, Ultra and an ANTEC, combos of all those none of them wore running easiliy, all maxed out and caused issues. Replaced with 1200s and 1500watt psus on 9 high dollar builds and no issues, well worth it if your overclocking cpu, gpu or both and running hard core or mining.
If you gotta go a 1000, get the ultra x4 1000 watt, if they blow u get a new one easy, used many of those.
If you gotta go a 1000, get the ultra x4 1000 watt, if they blow u get a new one easy, used many of those.
What brand of 1200+ PSU have you had best results with?
Off topic, but goodness 38 6970's must be loud. I have 3 of them that whine like hell compared to Sapphire xtreme cards.
They're actually not too bad... The box fans on the window are louder. I'm bringing cool air into the room from an evap cooler mounted in an adjacent room. 6 of the 6970's are reference cards and the other 32 have very good coolers (MSI 6970 Lightnings). The reference cards are running at 65% fan speed and the non-reference are on auto.
I have 8 rigs running 4x6970's in them. With the memory clocked down and the voltage dropped a little, each machine is pulling 1049W from the wall. This means that the PSU is probably seeing around 950W on the input side. These machines have AMD X3 445's in them with two of the cores disabled. Only one stick of RAM is being used. They are booting from a flash drive as well (no hard drive).
With a quality power supply, you could probably get by with a 1000W PSU if you keep the memory clocks down. Underclocking the video RAM and undervolting the cards dropped 100 watts (at the plug) on each rig. 2x6990's will use a little less power than 4x6970's, but not by much. Another thing to consider is that a PSU is usually most efficient around 75% load. Coughing up the extra cash for more than a 1000W PSU might save some electricity in the long run.
With a quality power supply, you could probably get by with a 1000W PSU if you keep the memory clocks down. Underclocking the video RAM and undervolting the cards dropped 100 watts (at the plug) on each rig. 2x6990's will use a little less power than 4x6970's, but not by much. Another thing to consider is that a PSU is usually most efficient around 75% load. Coughing up the extra cash for more than a 1000W PSU might save some electricity in the long run.
The good side is that a 6990 will draw much less power than 2 normal 6970's, because the chips in 6990's are hand picked to work on the lowest possible voltages.
A 6990 at stock consumes only 375 watts while two 6970's consume about 500 watts.
Off topic, but goodness 38 6970's must be loud. I have 3 of them that whine like hell compared to Sapphire xtreme cards.
I have 8 rigs running 4x6970's in them. With the memory clocked down and the voltage dropped a little, each machine is pulling 1049W from the wall. This means that the PSU is probably seeing around 950W on the input side. These machines have AMD X3 445's in them with two of the cores disabled. Only one stick of RAM is being used. They are booting from a flash drive as well (no hard drive).
With a quality power supply, you could probably get by with a 1000W PSU if you keep the memory clocks down. Underclocking the video RAM and undervolting the cards dropped 100 watts (at the plug) on each rig. 2x6990's will use a little less power than 4x6970's, but not by much. Another thing to consider is that a PSU is usually most efficient around 75% load. Coughing up the extra cash for more than a 1000W PSU might save some electricity in the long run.
With a quality power supply, you could probably get by with a 1000W PSU if you keep the memory clocks down. Underclocking the video RAM and undervolting the cards dropped 100 watts (at the plug) on each rig. 2x6990's will use a little less power than 4x6970's, but not by much. Another thing to consider is that a PSU is usually most efficient around 75% load. Coughing up the extra cash for more than a 1000W PSU might save some electricity in the long run.
The good side is that a 6990 will draw much less power than 2 normal 6970's, because the chips in 6990's are hand picked to work on the lowest possible voltages.
A 6990 at stock consumes only 375 watts while two 6970's consume about 500 watts.
So im running 2X6990 on a 1200w psu
I saw a bitcoin miner review on the web that claims the 6990 can draw up to 600w's on full load?
http://www.hardocp.com/article/2011/07/13/bitcoin_mining_gpu_performance_comparison/4
Anyone have any comment on that?
I saw a bitcoin miner review on the web that claims the 6990 can draw up to 600w's on full load?
http://www.hardocp.com/article/2011/07/13/bitcoin_mining_gpu_performance_comparison/4
Anyone have any comment on that?
Im telling you from exeprience get a 1200 or 1500 watt good power supply. I have had tests and builds with all the newest cards and PSU and 1000 watt corsair, Ultra and an ANTEC, combos of all those none of them wore running easiliy, all maxed out and caused issues. Replaced with 1200s and 1500watt psus on 9 high dollar builds and no issues, well worth it if your overclocking cpu, gpu or both and running hard core or mining.
If you gotta go a 1000, get the ultra x4 1000 watt, if they blow u get a new one easy, used many of those.
If you gotta go a 1000, get the ultra x4 1000 watt, if they blow u get a new one easy, used many of those.
I'm going to say one thing, Dont use that 1tb as your main drive.
its going to get fragmented quick.
Use a smaller hard drive as your system drive and the 1tb as storage.
a 160 gig would be good for windows 7 to live on even can live on 40 gig if you had to,.
its going to get fragmented quick.
Use a smaller hard drive as your system drive and the 1tb as storage.
a 160 gig would be good for windows 7 to live on even can live on 40 gig if you had to,.
I have a 1350W PSU running 3x6990 just fine.
what's the PSU efficiency and how many watts are you pulling from the wall?
I have a 1350W PSU running 3x6990 just fine. I don't have anything over- or under-clocked, and my hash rates are great (~2200 MH/s). The system also includes an AMD Phenom 4C CPU at 2.66 GHz, 8 GB RAM, and other normal PC components to make it a usable system for gaming and such -- in case this whole bitcoin thing doesn't work out. 
I have 8 rigs running 4x6970's in them. With the memory clocked down and the voltage dropped a little, each machine is pulling 1049W from the wall. This means that the PSU is probably seeing around 950W on the input side. These machines have AMD X3 445's in them with two of the cores disabled. Only one stick of RAM is being used. They are booting from a flash drive as well (no hard drive).
With a quality power supply, you could probably get by with a 1000W PSU if you keep the memory clocks down. Underclocking the video RAM and undervolting the cards dropped 100 watts (at the plug) on each rig. 2x6990's will use a little less power than 4x6970's, but not by much. Another thing to consider is that a PSU is usually most efficient around 75% load. Coughing up the extra cash for more than a 1000W PSU might save some electricity in the long run.
With a quality power supply, you could probably get by with a 1000W PSU if you keep the memory clocks down. Underclocking the video RAM and undervolting the cards dropped 100 watts (at the plug) on each rig. 2x6990's will use a little less power than 4x6970's, but not by much. Another thing to consider is that a PSU is usually most efficient around 75% load. Coughing up the extra cash for more than a 1000W PSU might save some electricity in the long run.
The good side is that a 6990 will draw much less power than 2 normal 6970's, because the chips in 6990's are hand picked to work on the lowest possible voltages.
A 6990 at stock consumes only 375 watts while two 6970's consume about 500 watts.
The OC switch complicates things a bit as it will make the card consume 450 watts, so that's a total of 900W (bit more at the wall).
Counting in processor, ram, HDD, mobo power requirements, a quality 1kW supply could just about pull it off.
I do have one such setup, but with a Corsair 1200W PSU to be on the safe side.
i don't personally own a 6990, but there seems to be some conflicting numbers on the power consumption. so is it 300w, 330w, 375w, or 450w? i think i read the reviews on these and it has a stock TDP of 300w, and there's a flip of a switch that will bring performance up, where it has a TPD of 450w.
when i said that 2x 6990 should be able to work on this 1000w, i just assumed it was 450w TDP, which a 1000w quality PSU should be barely enough since video cards never pass that power limit, even at 100% load on stock clocks.
Correct. Once you flip that switch and OC that card a little, I'm positive that two 6990's in a minimal system will draw somewhere around 1000 watts at the wall. when i said that 2x 6990 should be able to work on this 1000w, i just assumed it was 450w TDP, which a 1000w quality PSU should be barely enough since video cards never pass that power limit, even at 100% load on stock clocks.
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