Phil,

Don't worry most of "these people's" barks are worse than their bite.    We appreciate all the testing you are doing here, I am very anxious to see the 2980's numbers, sounds like prelude was right on the money so far.

Also, did you by chance compare voltage by back-probing the loaded PCIe cables to see if there's any noticeable voltage drop vs the loose one?  and if the avalon's gui for voltage is accurate? I've heard varying testimonies about it.

Just my luck that I only have enough power to run two 2880 PSU and not three.  I wonder if it's possible to use the 180mm fan with just two units stacked.

Are those standard 3 pin headers?  I hope the 2880s have them too.  I'm not sure that the area is wide enough for two 120mm fans since kilo's 180mm seems to fit pretty well.

Thanks Finksy, guess no more using the EVGA going forward and just stick to my 2000W PSUs.  Can't wait to get your new 4K boards!!!!!!!!!!!!!!   


Phillip - What should I expect at the walls w the 2K PSU for Batch 8 @standard Freq?

It should be 99.46% load on a 1300w G2. The math is 1293W/0.88eff(@120v input)=1470W at the wall. Just a bit over the 12A/15A 80% limit. Not excellent but not bad either. Should be getting mine tomorrow to get some real world tests.

2880 watt psu tests

30 min

amps 9.1
volts 241
dc  12.20
dc  12.10
dc   12.00
hash 6879
watts 2193
watts per gh 0.3188

1 hour

amps  = 9.0
volts   = 241
dc      = 12.20 at the one un - used pcie cable
dc      = 12.10 at avalon 1 software reading
dc      = 12.00 at avalon 2 software reading
hash  = 6872
watts = 2169
watts per gh = 0.3156

2 hour

amps  = 9.0
volts   = 241
dc      = 12.20 at the one un - used pcie cable
dc      = 12.10 at avalon 1 software reading
dc      = 12.00 at avalon 2 software reading
hash  = 6849
watts = 2169
watts per gh = 0.3166


7 hour

amps            = 8.9 9.0
volts             = 240
dc                = 12.20
dc                = 12.2    at avalon 1
dc                = 11.9    at avalon 2
dc                = 11.98   backprobe of both avalons were 11.97 and 11.98
watts           =  2160
hash            =  6830
watts per gh =  0.3162


I am done with   2880 watter

Next is 2980

30 Min

amps          =   8.5
volts           =  240
dc               =  12.15--------empty pcie
dc               =  12.10 -------avalon 1
dc               =  12. 00 ------ avalon 2
dc               =    ?         backprobe is hard to do
watts           =  2040     this is a 120 watt improvement   but dc is 12.15  vs 12.20
hash            =   6780        this is slightly less due to lower volts
watts per gh =  0.3008      this is  better then  any of the 2880, but by a little more like 4.9%  not quite 6%

early test  of the 2980  will do more in the morning.

A note on the 2880w  pulling the fan pack is easy to do
a note on the 2980w  pulling the fan pack is hard to do.

second note the 2880w  will allow you to do the kilo17 mod.

the 2880w is a special 4 pin with a jumper setup for each of the 3  fans the psu's will run with fans not attached.

the 2980w is  a tiny four pin pwm  you may not be able to run the 2980w with out the fan pack attached.



so all I am sure of is the 2980 stock runs 5% better then the 2880 stock. in the 30 minute test.

2880 watt psu tests

30 min

amps 9.1
volts 241
dc  12.20
dc  12.10
dc   12.00
hash 6879
watts 2193
watts per gh 0.3188

1 hour

amps  = 9.0
volts   = 241
dc      = 12.20 at the one un - used pcie cable
dc      = 12.10 at avalon 1 software reading
dc      = 12.00 at avalon 2 software reading
hash  = 6872
watts = 2169
watts per gh = 0.3156

2 hour

amps  = 9.0
volts   = 241
dc      = 12.20 at the one un - used pcie cable
dc      = 12.10 at avalon 1 software reading
dc      = 12.00 at avalon 2 software reading
hash  = 6849
watts = 2169
watts per gh = 0.3166


7 hour

amps            = 8.9 9.0
volts             = 240
dc                = 12.20
dc                = 12.2    at avalon 1
dc                = 11.9    at avalon 2
dc                = 11.98   backprobe of both avalons were 11.97 and 11.98
watts           =  2160
hash            =  6830
watts per gh =  0.3162


I am done with   2880 watter

Next is 2980

30 Min

amps          =   8.5
volts           =  240
dc               =  12.15--------empty pcie
dc               =  12.10 -------avalon 1
dc               =  12. 00 ------ avalon 2
dc               =    ?         backprobe is hard to do
watts           =   2040     this is a 120 watt improvement   but dc is 12.15  vs 12.20
hash            =   6780        this is slightly less due to lower volts
watts per gh =  0.3008      this is  better then  any of the 2880, but by a little more like 4.9%  not quite 6%

14 hour results

amps      = 8.5
volts       = 240
dc           = 12.15 -----empty pcie
dc           = 12.10 ----- avalon 1
dc           = 11.90 ----- avalon 2
dc           = 11.94  ------ backprobe of a pcie cable under load
watts      =  2040 ------  
hash       =  6798 -----
watts per gh =  0.30008    



A note on the 2880w  pulling the fan pack is easy to do
a note on the 2980w  pulling the fan pack is hard to do.

second note the 2880w  will allow you to do the kilo17 mod.

the 2880w is a special 4 pin with a jumper setup for each of the 3  fans the psu's will run with fans not attached.

the 2980w is  a tiny four pin pwm  you may not be able to run the 2980w with out the fan pack attached.



 I am sure o the 2980 stock runs 5% better then the 2880 stock. in the 30 minute test. and a longer overnight test.



I am going to do back probe at the avalon on dc  done


 then do the dual 2000/4000 tests    next to do.

_______________________________________________________________________________ ___________
the dual 2000/net 4000 setup has 3 volts setting and some more tweaking with a small pot.

top volts setting 90 minutes

amps =      12  could be more my pdu does .0 until I reach 10   so if I go above 10 readings are really +- 240 watts
volts  =    240
dc     = 12.84
dc     = 12.7
dc     = 12.5
dc     = 12.2 backprobe numbers
watts              =2880    
hash               = 8000
watts per gh    = 0.3597   I know the avalon chip burns more power when overclocked so this is not a helpful judge of the psu's eff



middle volts setting 90 minutes

amps       =      9.6  
volts        =    240
dc            = 12.22
dc            = 12.3 avalon 1
dc            = 12.0 avalon 2
dc            = 12.01 backprobe numbers
watts        = 2304
hash         = 7167
watt per gh = 0.3214   this is disappointing  I need to check again as this puts the dual 2000/4000 net in last place at the close to 12.15-12.22 volt out

also this is 4000 watt capacity so 2300/4000 is closer to half load I would have thought I would do better.

 now results at  12.15-12.22 volt settings

2880watter  at 12.20 did   .3188 watts a gh

2980watter  at  12.15 did  .30008 watts a gh

4000watter at 12.22 did     .3214 watts a gh


the 4000 watt dual is vey quiet and is using only 15-18 watts for cooling

both the 2980 and the 2880   use the stock 3 fan pack of tiny loud deltas at 60 watts.

So I need to keep testing the 4000 watter to see if I have an error.
I also nee to setup the 180mm cooling fan with the 2980 psu.

that will be for the weekend.

the big kilo17 fans just got delivered I will be testing more.

One thing more on the low under volt clock of the 4000 watt setup

you can run the gear really quiet.  and I am using 7.6 amps for 2 avalon6s  so    you can run 4 avalon6's  easy with the dual 2000  at low speed