bigjme
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September 26, 2014, 10:36:03 AM |
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850watt psu for 2 gtx980 and 1 780ti doable ? (with a i7-3770 which doesn't use lots of power)
gpu's would be using probably 600w or more. factory in around 110w for full system loads. Your cutting it close at 90% efficiency. The 980's have been known to use 200w when overclocked
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djm34
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September 26, 2014, 10:54:32 AM |
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that, for sure, won't make the compilation faster ![Grin](https://bitcointalk.org/Smileys/default/grin.gif)
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Amph
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September 26, 2014, 10:55:01 AM Last edit: September 26, 2014, 11:05:27 AM by Amph |
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I need to get a single 970 to test on.
you really should lol and put that bitch on super oc mode, i want to see x3 750ti I have 2x Palit GTX 970 delivered yesterday, not impressed so far, think they might be going for a return trip back up the river in a couple of weeks if nobody works any magic.
I am getting the following rates, per card, using driver 344.16, with +200gpu & +200mem
XCN 8mh XMR 440h X13 4.8mh Scrypt Jane 6KH
Not tried BBR yet cause can't get 970's to work with Kopiemtu
System is drawing aprox 380w (not inc display) at wall, AMD quad core cpu so the 970's are using aprox 100w per card.
usually the cpu is in semi-idle, so it's more than 100w per card, or your system was completely at full(cpu included)? because 100w for 4.8mh on x13 is good, on the same algo you need 125 with 750ti
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djm34
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September 26, 2014, 11:13:44 AM |
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I need to get a single 970 to test on.
you really should lol and put that bitch on super oc mode, i want to see x3 750ti I have 2x Palit GTX 970 delivered yesterday, not impressed so far, think they might be going for a return trip back up the river in a couple of weeks if nobody works any magic.
I am getting the following rates, per card, using driver 344.16, with +200gpu & +200mem
XCN 8mh XMR 440h X13 4.8mh Scrypt Jane 6KH
Not tried BBR yet cause can't get 970's to work with Kopiemtu
System is drawing aprox 380w (not inc display) at wall, AMD quad core cpu so the 970's are using aprox 100w per card.
usually the cpu is in semi-idle, so it's more than 100w per card, or your system was completely at full(cpu included)? because 100w for 4.8mh on x13 is good, on the same algo you need 125 with 750ti trying to recompile with compute 5.2 might be worthwhile (so they say...)
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jack80
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September 26, 2014, 01:43:33 PM |
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850watt psu for 2 gtx980 and 1 780ti doable ? (with a i7-3770 which doesn't use lots of power)
Yes 165Watt x 2 = 330 watt for 2 980 + 250 watt 780ti = 580 watt .
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bigjme
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September 26, 2014, 01:49:07 PM |
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850watt psu for 2 gtx980 and 1 780ti doable ? (with a i7-3770 which doesn't use lots of power)
Yes 165Watt x 2 = 330 watt for 2 980 + 250 watt 780ti = 580 watt . plus the cpu and the rest of the system, adding to roughly 110W (to be safe), allow for gpu self and manual overclocking, 40w total = 730w 850w @ 90% eff = 765w (psu efficiency often gets lower the closer to maximum you get) ~spare = 35w just be careful djm, it may be a good idea to put a kill-a-watt meter on the system if you have one, then add one 980, then another and just see how close they get running some benchmarks each time
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djm34
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September 26, 2014, 02:47:21 PM |
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850watt psu for 2 gtx980 and 1 780ti doable ? (with a i7-3770 which doesn't use lots of power)
Yes 165Watt x 2 = 330 watt for 2 980 + 250 watt 780ti = 580 watt . plus the cpu and the rest of the system, adding to roughly 110W (to be safe), allow for gpu self and manual overclocking, 40w total = 730w 850w @ 90% eff = 765w (psu efficiency often gets lower the closer to maximum you get) ~spare = 35w just be careful djm, it may be a good idea to put a kill-a-watt meter on the system if you have one, then add one 980, then another and just see how close they get running some benchmarks each time ok... I don't have one, but I might buy one. (In the mean time I can always run with either the 750ti or the 660... which is a bit counter productive though...) However, I have a few spare psu (but not as good as the corsair...) Do you know what is needed to combine 2 psu ? (I was able to found a sli bridge... )
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bigjme
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September 26, 2014, 03:01:18 PM |
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850watt psu for 2 gtx980 and 1 780ti doable ? (with a i7-3770 which doesn't use lots of power)
Yes 165Watt x 2 = 330 watt for 2 980 + 250 watt 780ti = 580 watt . plus the cpu and the rest of the system, adding to roughly 110W (to be safe), allow for gpu self and manual overclocking, 40w total = 730w 850w @ 90% eff = 765w (psu efficiency often gets lower the closer to maximum you get) ~spare = 35w just be careful djm, it may be a good idea to put a kill-a-watt meter on the system if you have one, then add one 980, then another and just see how close they get running some benchmarks each time ok... I don't have one, but I might buy one. (In the mean time I can always run with either the 750ti or the 660... which is a bit counter productive though...) However, I have a few spare psu (but not as good as the corsair...) Do you know what is needed to combine 2 psu ? (I was able to found a sli bridge... ) honestly for now, take out the 780ti, and run the 2 980's merging 2 psu's isn't too hard when using risers, but connected to a motherboard it can cause problems you may have a cable for it already, its something like this http://www.ebay.co.uk/itm/Dual-PSU-Power-Supply-Adaptor-Cable-/201039164610?pt=UK_Computing_Other_Computing_Networking&hash=item2ecede34c2i used one when running my mining cards on a separate psu.
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Cooldogin
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September 26, 2014, 03:29:21 PM |
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850watt psu for 2 gtx980 and 1 780ti doable ? (with a i7-3770 which doesn't use lots of power)
Yes 165Watt x 2 = 330 watt for 2 980 + 250 watt 780ti = 580 watt . plus the cpu and the rest of the system, adding to roughly 110W (to be safe), allow for gpu self and manual overclocking, 40w total = 730w 850w @ 90% eff = 765w (psu efficiency often gets lower the closer to maximum you get) ~spare = 35w just be careful djm, it may be a good idea to put a kill-a-watt meter on the system if you have one, then add one 980, then another and just see how close they get running some benchmarks each time Just a FYI on the eff value, that value isn't the output from the PSU into the case, it's how efficient the PSU is at converting AC -> DC and thus it's draw from the wall. Your 850W PSU is rated at 850W and will always output that for the components into the case if needed but it would then pull ~935W from the wall. That being said I always build a ~10% safe value into my builds anyway so I'm not running the PSU at 100% all the time and, as bigjme pointed out, the closer to 100% load the lower the efficiency gets. PSU manufacturers should post their curves online somewhere to let you target the bet place to keep your PSU load wise as well.
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bigjme
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September 26, 2014, 03:43:18 PM |
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850watt psu for 2 gtx980 and 1 780ti doable ? (with a i7-3770 which doesn't use lots of power)
Yes 165Watt x 2 = 330 watt for 2 980 + 250 watt 780ti = 580 watt . plus the cpu and the rest of the system, adding to roughly 110W (to be safe), allow for gpu self and manual overclocking, 40w total = 730w 850w @ 90% eff = 765w (psu efficiency often gets lower the closer to maximum you get) ~spare = 35w just be careful djm, it may be a good idea to put a kill-a-watt meter on the system if you have one, then add one 980, then another and just see how close they get running some benchmarks each time Just a FYI on the eff value, that value isn't the output from the PSU into the case, it's how efficient the PSU is at converting AC -> DC and thus it's draw from the wall. Your 850W PSU is rated at 850W and will always output that for the components into the case if needed but it would then pull ~935W from the wall. That being said I always build a ~10% safe value into my builds anyway so I'm not running the PSU at 100% all the time and, as bigjme pointed out, the closer to 100% load the lower the efficiency gets. PSU manufacturers should post their curves online somewhere to let you target the bet place to keep your PSU load wise as well. yes sorry, eff when i quote it in that instance is usually a 10% safe guard as psu's are known to fail when ran full out. i put eff so none technically minded people understand easier ![Smiley](https://bitcointalk.org/Smileys/default/smiley.gif) should have explained that better
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axzerrouni
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September 26, 2014, 03:43:56 PM |
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What coin is best for 750ti Now ??
DGB is disable. ToT
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Amph
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September 26, 2014, 04:07:07 PM |
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What coin is best for 750ti Now ??
DGB is disable. ToT
try x-children, it seems the most profitable for now probably not anymore after this post lol
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djm34
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September 26, 2014, 04:50:03 PM |
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What coin is best for 750ti Now ??
DGB is disable. ToT
try x-children, it seems the most profitable for now probably not anymore after this post lol you can try coca-cola coin when it gets launched... I am pretty sure it will be huge if there is a lawsuit (and vice versa...) ![Grin](https://bitcointalk.org/Smileys/default/grin.gif)
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bigjme
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September 26, 2014, 04:53:13 PM |
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What coin is best for 750ti Now ??
DGB is disable. ToT
try x-children, it seems the most profitable for now probably not anymore after this post lol you can try coca-cola coin when it gets launched... I am pretty sure it will be huge if there is a lawsuit (and vice versa...) ![Grin](https://bitcointalk.org/Smileys/default/grin.gif) Have you installed your 980's yet?
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djm34
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September 26, 2014, 05:02:47 PM |
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What coin is best for 750ti Now ??
DGB is disable. ToT
try x-children, it seems the most profitable for now probably not anymore after this post lol you can try coca-cola coin when it gets launched... I am pretty sure it will be huge if there is a lawsuit (and vice versa...) ![Grin](https://bitcointalk.org/Smileys/default/grin.gif) Have you installed your 980's yet? no not yet, will do that a bit later (I have downloaded the drivers and installed the new version of cuda 6.5)
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bigjme
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September 26, 2014, 05:03:46 PM |
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Have you installed your 980's yet?
no not yet, will do that a bit later (I have downloaded the drivers and installed the new version of cuda 6.5) waiting patiently..... kind of
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djm34
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September 26, 2014, 05:27:07 PM |
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Have you installed your 980's yet?
no not yet, will do that a bit later (I have downloaded the drivers and installed the new version of cuda 6.5) waiting patiently..... kind of is the 3dmark demo version on steam is ok for testing ?
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bigjme
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September 26, 2014, 05:28:04 PM |
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Should be. I've found some results anyway but want to see what you get
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