need some serious help on power and graphics

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Faredoon

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Jun 17, 2014
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guys i have a 500w power supply of a brand called vip i am planning to buy the r9 280 graphic card it requires 500w power supply 2 * 6 pin power supply now the problem is my smps has 1 6pin and 1 8pin power socket but the 8pin socket can be made into 6pin by removing the 2pins from the 8pin socket so thn i have 2 6pins wires on my smps so can i actually use the 2 6 pin ports for my graphic card 8pin by removing the 2pins from it (i can slide off the 2 pins remember i have an option) so will doing this blow up my pc

on the 6 and 8 pin ports which come from the smps its written v300 on the wires


 
Solution
M
Theoretically yes!
Your psu have two rails and one supply for gpu and other supply processor and mobo
A 6 pin connector can only give 75w
So with any card that requires two 6 pin
Only requires 150w from one rail
Which means 13A
So for that rail it can supply upto 17 and you are safe
Well in other rail your cpu use maximum 84w and pci-e slot can only give 75w maximum
Again we are looking at 160 which means 13A
And your psu can give it
And practically nothing uses its maximum rated power unless you overclock!
So well theoretically you can use any vga which requires two six pin connectors with your pc!
And it won't blow up!
But it's not recommended!
Because with time psu won't give away rated power and your pc may turn off automatically...
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masteranu

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Nov 30, 2014
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Those 6+2 pins are made for use situations like that! Problem is not in pins or watts written in psu!
You should need sufficient amperage in psu!
Check graph written on psu and tell us +12v output amperage
 
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jossrik

jossrik

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Sep 26, 2002
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The short answer is you should be fine. As long as you don't have to modify the pins, they have different shaped plastic parts surrounding them, so only the right mix of pins will work, but there are a lot of 8 pin connectors that have a 2 pin on the side that make them 8 from 6. Should be all right. The long answer is that you need a new PSU.

This is the tiered list we all pretty much go by, not all 500W PSUs are the same ya know.
http://www.tomshardware.com/forum/id-1804779/power-supply-unit-tier-list.html

Rocommended Viewing: The reason you don't want a crappy PSU: https://www.youtube.com/watch?v=Ezk9OA7aKOE
 
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masteranu

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Nov 30, 2014
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Got ur picture!
Well you are on margin!
Your card comsume about 200w maximum
200w/12v =16.6 A
It took 150w maximum from 6 pin connectors And rest power from pci-e slot
Let's put 100w for all other components including cpu
Then your pc using maximum 300w
Your power supply can give away 360w(30A) maximum 12v power output
So
Yes you can use this psu to power up your vga
But...
Your psu is not branded psu
Those psu don't give away sufficient power for long time!
So you can't depend on that psu forever!
But until you find money and buy new one you can use this!
If power was in sufficient psu will turn itself off automatically!
So for few months you should be safe!
But buy a new psu asap!
When buying new one just consider these!
Buy at least bronze certified psu
Make sure it has 2 six pin (or 6+2)
Mostly check that graph
For safety buy 35A or more 12v output rated psu!
Your psu have 17 and 17 in two rails!
But total output is not 34!
This is how to calculate maximum output!
In that graph there's total 12v output in watts!
In your picture it says 360w right!
Then devide it with 12v
(Equation we use is P=IV)
It means 360/12= 30A
You don't need that much power with your specs
But with time psu can't give away rated power
So for safety go with 35A or more when buying next time!
 
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jossrik

jossrik

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From what I could find on the net, the R9 280 needs 35 amps on the 12V rail to work right, and that would be maxing your PSU out, provided your PSU can push that you'd be severely reducing the lifespan of your PSU. Recommended minimum is a 550W PSU: http://www.realhardtechx.com/index_archivos/Page362.htm

It *should* work, but you might have stability issues, and you will not be able to overclock very well. Worst case, you buy a new PSU later rather than sooner, with any luck the PSU doesn't take any of your other parts out with it. Best case it works fine and you're good to go. I'd be wary. Bad news early is better than short shipping times late in the game.
 
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masteranu

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Hey josstick that's recommended total system power which means with a i7 cpu (i can't remember the excact model) which use 170W
But i don't think he have that cpu!
Most i7 cpus people use nowadays only use 90W maximum!
So what written in box is not valid for everyone!
Power consumption is totally depend on components he have!
 
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masteranu

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He have i7 4770k which use 84 maximum and gpu which use 200w maximum
But no component use maximum rated power in any condition!
He only use 300W maximum with his components
So he's totally fine for few period!
Bt as u said it's good to buy new one if overclocking
And yeah when using 1000$ parts in pc
It's not a waste to buy 70$ branded psu for safety
 
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masteranu

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Nov 30, 2014
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Theoretically yes!
Your psu have two rails and one supply for gpu and other supply processor and mobo
A 6 pin connector can only give 75w
So with any card that requires two 6 pin
Only requires 150w from one rail
Which means 13A
So for that rail it can supply upto 17 and you are safe
Well in other rail your cpu use maximum 84w and pci-e slot can only give 75w maximum
Again we are looking at 160 which means 13A
And your psu can give it
And practically nothing uses its maximum rated power unless you overclock!
So well theoretically you can use any vga which requires two six pin connectors with your pc!
And it won't blow up!
But it's not recommended!
Because with time psu won't give away rated power and your pc may turn off automatically!
I won't think psu will blow off!
Usually that happens when you connect components which use more power than it uses
Like if you have 150w using cpu and pci-e uses another 75 one rail have to give away 225w= 18 A
Which your psu can't handle
So it can blow off while gaming!
It happend to me once!
But didn't fry any other component with it!
So yeah theoretical you can and it won't blow off
But for safety asap buy a better psu after buying gpu!
 
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Solution
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masteranu

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Nov 30, 2014
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R9 270 is safer okay!
280 is a risk
Coz it asks one six pin and one 8pin(sorry my bad i told you that you are safe with any vga requires 2 six pins, i missed 280 requires 8 pin which gives away 150w maximum)
280 uses 250w maximum
If we assume pci-e give 55w
Other rail have to give away away 190w eqals 16A
Which is about same as close to maximum of your psu can give away
When giving maximum it can blow away
So when buying card worth that much you better buy psu along with it
I don't risk it
But any card which requires two 6 pins are safe for now
Sorry again about missing 280 requires 8 pin connector
I thought both reqires 2 six pins
My bad!
I teach you the lesson about calculation
So you can work out yourselves now :)
Hope i helped
Sorry again about missing that 8 pin

 
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jossrik

jossrik

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75 watts through the PCIe slot
6 pin is 75 watts
8 pin is 150 watts

That's the standard.
Though, a video card can technically draw more than that if it needs to, it's just not standard to do that.
 
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masteranu

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Nov 30, 2014
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Yeah faradoon is right
But usually non overclocked graphic cards don't draw more than that
2 6 pin + pci-e eqals 225W
There's no graphic card in my knowledge which requires 2 six pins and is rated over 200W
If any card requires over 200W most of cases it ask one or two 8 pins
 
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