any psu experts, need some help

Nickolp1974

Nickolp1974

Nickolp1974

Soldato
Joined
15 May 2012
Posts
5,828
Location
Louth, lincs
trying to determine a lock up problem i get with overclocking my 7970 lightning, i get lockups when running benchmarks over 1325 v, temps are fine at this v.core can someone tell me if my psu can handle this here is a lnk to a review and specs on rails

http://www.bit-tech.net/hardware/2007/05/10/700w_to_850w_psu_group_test/3

lightning at stock speeds/volts consumes approx 422w @100% load

i am connected to psu via the 2 8pin connectors, 1@top and 1@bottom.

looks like on the chart my psu can only handle 18A and a max power draw of 216w on 1x 12v rail.

would like to have a go at a watercooling set up once blocks are available, so my question is, do i need a new psu????
 
mp260767 said:
check this, the psu they used on the test you linked:

http://www.techpowerup.com/reviews/Antec/HCP-1200/2.html

its got 30A on each 12v rail, spread over 8, not 6 like yours, the rest is pretty comparable.

have you tried working up from the defaults to see where you start to encounter issues ?

also worth noting the following on the review you linked, so it might NOT be just a graphics issue:

Unfortunately, despite the fact that the Cooler Master is a great looking unit with a very quiet fan it consistently failed as a PSU as the load was increased. The 5V rail is predominantly used by hard drives and optical drives, but also a few motherboard components make use of it too.

With a low 5V rail you can suffer cold boot issues as your drives compete for juice when they spin up. At 100 percent load we also see a low 3.3V, and consistently throughout we have a borderline acceptable 5V standby voltage.
Click to expand...


have had many cold boot issues, solved double post(asus board) but sometimes will not boot, saying OC failed, restart and all is fine and also had 1 HDD go(not uncommon but who knows the cause)
 
thanks tealc/mp260767 for the info

so if my psu is approx 80% eff does than mean i have 680w to play with basically????
and i'm using 620w(gfx@stock and [email protected]), does this mean i have 60w left to play with???
so with my current spec theoretically i'm running my psu @91%???????????????
 
Just used a rough calculater which i found on the net, most probably inaccurate then. Just trying to rule it out. But what does concern me if you look at post #6 the quote then my answer. Did not even think about the psu with that one
 
Taken from thermaltake website recomMends 505w but to quote

The total PSU Wattage this tool recommends will give a general idea of the range of continuously available power (not peak power) at which you should be looking. But if you are planning to build a high end gaming system, total Amperage available on the +12V rails—and how that capacity is distributed—could be as or more important than total Watts of Power


4 * Electrolytic capacitor aging. When used heavily or over an extended period of time (1+ years) a PSU will slowly lose some of its initial wattage capacity. We recommend you add 20% if you plan to keep your PSU for more than 1 year, or 25-30% for 24/7 usage and 1+ years.
* * See our Terms of Service for details.

Had my psu for 5 years and its on nearly everyday for a couple of hours, my amperage is low compared to modern psu's, please advise.
 
Last edited:
Does not do the double boot after changing a few settings but occasionaly just wont boot first time, either hangs or it says oc failed. So i just reset it and alls fine with oc settings and before you ask it can run prime for 12 hours and no probs and done memtest and no probs.
 
just checked bios and its showing 12.096v
are there any other in windows software where i can check this, i know it will not be accurate and your assumptions are correct i dont have the equipment to test.
 
pastymuncher said:
Just because it can prime for 12 hours does'nt mean it's stable. I have had prime fail after 18 hours before. I have also had a rig pass 24 hours of prime only to fall over in a game.

The only way to check psu voltages accurately is with a multimeter.
Click to expand...


ok thx, i know plenty of sparkies so will get hold of one
 
You must log in or register to reply here.
Back
Top Bottom