Possible psu OCP problem??

Soldato
Joined
15 May 2012
Posts
5,810
Location
Louth, lincs
Hi bud been doing some testing on some 780 classy's and wondered if you could help??
Been having a few hard shut downs when pushing both cards and a message which is to fast to read properly on the bios splash screen but it's on the lines of the psu's ocp was triggered due to instability,
My psu is the SF12000 plat.

My testing

Other day worked out max clocks for a voltage of 1.36v on cards independently then switched em both on and both were set to what i found there clocks to be and got a good score.(firestike)
Now did the same with 1.4v the good card managed 1520/2027!! And the other is hitting a wall at 1416/2027 which it will do at 1.36v so fired up both at those clocks and hard shut down with that message about ocp/instability, so dropped down the good card to 1500/2027 @1.39v and it passed but with a lower score than the run with both at 1.36v, tried again, lowered clocks and volts and score improved but still not beating the original one even though clocks are higher. During the bench there are no signs of instability.
I may grab a power meter and test to see what its drawing.


What do you think is causing this??

So running I have

CPU 1.47v
Gpu 1 1.4v
Gpu 2 1.3625v
2x 18w DDC
15x high powered fans
AQ6
4x ram
1x SSD
RIVBE
 
Had similar with my 3 Titans when pushing 3930K@ 5Ghz (1.495v) and the cards @ 1241/7200. (1.25v)

PC would just shut off and restart, using a Evga 1300 also tried a Antec 1300.

Now using Evga 1600w G2 - now able to run 5ghz and 3 cards @ 1319/7600 (1.325v).:D
 
It's gonna be pushing well over what that unit is capable off mate. Easily. You need to see what it's pulling from the wall, it will be well into 1400w. I had my 1200SF Plat at 1350w and my scores were suffering slightly.. couldn't have been far off OCP. They're great PSUs but Classifieds are brutal
 
My aim to improve, 335pts to go!! :D

1. 22727 marks k|ngp|n n/a 2x GeForce GTX 780 LN2 6.6pts 1 0
2. 21096 marks 8 Pack n/a 2x MSI GeForce GTX 780 LN2 5pts 0 0
3. 20761 marks nickolp1974 1450/2027 MHz 2x GeForce GTX 780 H2O 3.9pts 0 0

And FSX

1. 12056 marks k|ngp|n n/a 2x GeForce GTX 780 LN2 9.8pts 4 4
2. 11168 marks michel90 1474/1712 MHz 2x GeForce GTX 780 LN2 7.5pts 0 0
3. 11093 marks 8 Pack n/a 2x MSI Lightning GeForce GTX 780 LN2 6.1pts 0 1
4. 11040 marks nickolp1974 1450/2027 MHz 2x GeForce GTX 780 H2O 5.2pts 0 0
 
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