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Will this PSU be sufficient?

Last response: in Graphics & Displays
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July 3, 2011 12:56:48 PM

Hi guys,

I really need some advice.

My current system is a MSi GTX 550Ti Cyclone II OC (oc'd), bog standard 500w psu, Q8400 2.67ghz, 4gb ddr2, samsung syncmaster 22" @1920 X 1080.

This is fine at the moment and i can play all the current games and they all look decent with good fps.

I am however going to start upgrading my system to a better mobo that can support sli and ddr3.

What i would like to know from the wise ppl here is if i could go ahead and purchase an MSI GTX 460 Cyclone OC Edition 1GB and run it on my current system, keeping in mind that my PSU is an "Octigen 500W Power Supply (149898PSOTG)" with these specs -

Input voltage: 115V-230V
Input current: 10A
Total output of +3.3V and +5V shall not exceed 275W
+3,+5V and +12V total output power maximum is 486W
Rise time: 1~5ms
Hold up time: 16~20ms
Efficiency: 70%
Operating ambient: +10°C to +50°C/ Non-operating ambient -40°C to 70°C

It doesnt have a 6 pin connector but instead has 4 X molex which i could convert to 2 X 6 pin.

My question is would that be ok?

I plan to buy a new mobo and psu at some point but for now would it be best if i just played happily on my current system or go for broke and install the gtx460 i have my eye on?

Thx for your time and consideration guys.

More about : psu sufficient

July 3, 2011 1:41:41 PM

Now the 460 which you wanna buy has 2x6pin connectors. In this case the combined output current would be quite interesting.
Here you can see that a 460 card needs at least 48A as it seems. Check your PSU specifications, and if the max combined current output on the 12V rails in under 48A you'll have to upgrade your PSU ... I guess.

Truth be told I could use a little advise myself. I've bought a 560ti and now the performance got worse (compared to my old 4850HD). The minimum current output for a 560ti is supposedly 38A, and my PSU has only 34A. This COULD explain the bad performance, I'm not 100% sure though and I might need to buy a new PSU as well.
a c 272 U Graphics card
July 3, 2011 3:03:13 PM

jester131 said:
Now the 460 which you wanna buy has 2x6pin connectors. In this case the combined output current would be quite interesting.
Here you can see that a 460 card needs at least 48A as it seems. Check your PSU specifications, and if the max combined current output on the 12V rails in under 48A you'll have to upgrade your PSU ... I guess.

Truth be told I could use a little advise myself. I've bought a 560ti and now the performance got worse (compared to my old 4850HD). The minimum current output for a 560ti is supposedly 38A, and my PSU has only 34A. This COULD explain the bad performance, I'm not 100% sure though and I might need to buy a new PSU as well.

I think you need to learn a bit more about PSU's and graphic cards. A GTX560 uses about 170w which is about 14.2A not 38.
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July 3, 2011 3:26:12 PM

Mousemonkey said:
I think you need to learn a bit more about PSU's and graphic cards. A GTX560 uses about 170w which is about 14.2A not 38.


That's right, I don't know much about PSUs. But the reason why I thought that 34A are not enough for my 560ti is what the forum-user tyrsius wrote:

"I guess I need to apologize to everyone who correctly fingered the PSU. I went to a freinds house to swap hardware around to try to find the point of failure. He has a 650w PSU with 12V rails at 25A each. My 12V are 18A each. The 560ti says it requires 38A, which I though my PSU was delivering, however when running my friends psu into my computer the card ran amazingly."

My 12V are 20A each, combined 34A. And in his case an PSU upgrade made his system work properly. So how is that possible when you say that 14.2A i all I really need???

PS: I'm not sure if what tyrsius says is true, that the card requires 38A. But you are the expert here and surely can tell me more about that.
a c 272 U Graphics card
July 3, 2011 3:40:05 PM

The card itself does not require that much but the entire system might, that is why the card manufactures make those recommendations.
July 3, 2011 3:51:07 PM

Mousemonkey said:
The card itself does not require that much but the entire system might, that is why the card manufactures make those recommendations.


the question is still if a PSU upgrade will make a difference like in tyrsius' case, that's all I wanna know! Will it be a waste of money to buy a new PSU or should I keep looking for another source of the performance problem?
a c 272 U Graphics card
July 3, 2011 4:02:08 PM

jester131 said:
the question is still if a PSU upgrade will make a difference like in tyrsius' case, that's all I wanna know! Will it be a waste of money to buy a new PSU or should I keep looking for another source of the performance problem?

If the PSU was the problem then changing it would work but if the problem is elsewhere then it won't.
July 3, 2011 5:25:25 PM

This is what it says on my PSU -


+3.3V =28A
+5V =38A
+12V =17A
-5V =0.5A
-12V =0.8A
+5Vsb =2A


Does this mean i'tll be enough for a gtx460 if i use the 4X4pin molex converted to 2X6pin? (there is'nt a single 6 pin only the 4 molex)
...sorry but i dont entirely understand :??: 


thx
a c 272 U Graphics card
July 3, 2011 5:52:24 PM

op8 said:
This is what it says on my PSU -


+3.3V =28A
+5V =38A
+12V =17A
-5V =0.5A
-12V =0.8A
+5Vsb =2A


Does this mean i'tll be enough for a gtx460 if i use the 4X4pin molex converted to 2X6pin? (there is'nt a single 6 pin only the 4 molex)
...sorry but i dont entirely understand :??: 


thx

You're going to be cutting it close but it should work as a temporary PSU for a single 460.
July 4, 2011 1:47:33 AM

Mousemonkey said:
You're going to be cutting it close but it should work as a temporary PSU for a single 460.




thanks!
a b U Graphics card
July 4, 2011 11:54:37 AM

op8 said:
This is what it says on my PSU -


+3.3V =28A
+5V =38A
+12V =17A
-5V =0.5A
-12V =0.8A
+5Vsb =2A


Does this mean i'tll be enough for a gtx460 if i use the 4X4pin molex converted to 2X6pin? (there is'nt a single 6 pin only the 4 molex)
...sorry but i dont entirely understand :??: 


thx

An outdated POS with a single 17a 12v rail and no 6 pin connector ? And you want to run a 460 with it ?
It is the 4th of the July :lol: 
July 4, 2011 1:15:24 PM

delluser1 said:
An outdated POS with a single 17a 12v rail and no 6 pin connector ? And you want to run a 460 with it ?
It is the 4th of the July :lol: 




LOL...no i was just curious. i'm very happy with my current rig (see OP), but was wondering if i could install the 460 before i upgrade my mobo and psu.
i can run my gtx550Ti OC no probs on a twin molex - 6 pin converter, and have a spare couple of molex that i can convert to a 6 pin also.

I'm still not decided as to whether or not i should just buy myself another gtx550Ti and run it in sli (after getting new PSU ofcourse!).

Any thoughts on whether that would be a better option? considering the financial benefits, and also the fact that my beloved 550 isnt tossed aside and forgotten, and instead put to good use.(2 X gtx550Ti's are better than the best gtx 460 money can buy right?)
(the other option would mean having to buy a new gtx460, and maybe opting for SLi at some point in the future, but this means more money spent and i'm not 100% on what new hardware may be coming out that is a better option further down the line?


I hope this makes sense?
!