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Will my PSU manage?

howayman

howayman

howayman

Associate
Joined
15 Mar 2013
Posts
77
hi everyone. I'm new to the site but seeing as I have just bought a graphics card I wasn't originally going to get, I thought I had better ask the more knowledgeable of you if I have just created myself a headache or not.
The set up I am currently building is as follows.

Gigabyte hd 7770 oc (factory not me).
Asrock G41m vs3 2.0 mobo
Pioneer BDR 208DBK 15x burner
8gb corsair 1333mhz
Intel core 2 duo pc [email protected] ghz
500gb hd @ 5200 rpm
Windows 7 pro 64 bit.

Then there is my Psu. It is 80+ efficient and has the following specs
24.0A@+3.3v dc 24.0A@+5V dc 16.0A@12V1 dc 16.0A@+12V2 dc 0.50A@ -12V dc 2.50A@ +5VsB dc standby -MR

I need to OC PSU to 3.2 to 3.4 ghz.

But with me now buying the hd 7770 and not the Hd 6670 that I was originally going to buy I am not sure if I will have the necessary power to run i the rig stabily.

The PSU has a pci e connector so hooking it up isnt a problem, but now it wont draw power from the board hence the panic.

Its a brand new PSU so I dont want to bin it.

Im already over budget anyhow
 
Yeah I meant to say minimum.
Of course it should be at least 3.8 but until someone with more knowledge than me about PSU's says there is enough left over to push for it then even 3.2 is worrying

Ha ha you can tell its late. You are laughing at me saying PSu for overclocking instead of CPU.

Not the low bit I wanted to OC on for utilisation of RAM at 1333 ha ha

Time to turn in I think ha ha
 
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It would have been a lot easier just to post the brand/model/wattage of your PSU. Generally speaking, if your PSU is 500W or greater, then it is up to the task.

howayman said:
The PSU has a pci e connector so hooking it up isnt a problem, but now it wont draw power from the board hence the panic.
Click to expand...

This is a bit vague but I think I understand what you mean. The graphics card will still draw power from the board. From my understanding the PCI-E slot on your motherboard can supply the card with up to 75W of power. If the card requires more power (which yours obviously does) it will get the rest of the power it needs from the PCI-E cable. So you have nothing to worry about.
 
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Thanks for the reply. Sorry about the vagueness of the 'now it wont draw the power off the board' comment. It was late last night when I wrote it and even though I knew what I meant to say it didn't come out that way.

What I meant was that originally, I was going to put a 6670 in. The 6670 draws the power solely off the board. I shouldnt have went past 7750 if I am honest. It is this which has got me worried.

The Psu does have one PCI e connector though. It will no doubt be connected to one of the 12v*16A rails. The 7770 will draw most of the power from there, but yes, as you say, not all.

The 7770 needs a connector because it nust need more power than thepowered by the board lesser cards would need, else whats the point? It is this which has me worried.

Radeon arent much help either. They know that many so called 500w and 600w PSU's are lucky if they get 300w in reality and so they say the minimum PSU you should have for the 7770 is 450w.

My PSU is 400w but it is a real one if you know what I mean. It is 80+ and so will perform better than many of the so called 500w/600w ones.

I do need to overclock the cpu though. Ideally to 3.8 ghz so that the 1333 mhz ram will be used properly.


As for the make, I purposely stayed away from that because people rate makes by their own experiences and not what an individual psu can do.

In this case it doesnt really matter. It is an FSP but it is an OEM one.
Yes FSP have made poor psu's and yes they have made good ones. They even mak them for themselves now.
They still manufacture for other companies though. Some good some bad. This PSU is one of the better ones. It by all accounts is 80+ efficient.

I just cant get my head around the maths.

I am doing this rig as a favour for an elderly couple. They dont have much money but rely on the internet.

They were quoted £165 to repair their old pc when their p35 mobo died. It was insaneso I said I would do it for free, just parts to pay for and would do it so that they could use most of the parts again in the future. Apart from mobo and cpu that is.

So I swapped their old dvd writer for a blueray one, so that they could save family videos to blueray as well as watch blue ray movies. Upgraded their 2gb ddr2 ram to 8gb 1333mhz corsair ram, got a g41m vs3 rev 2.0 board to use their e6750 cpu from their old board and will over clock it.

I then got the fsp psu to replace the naff 500w ocz one they had (it is one of ocz poorer ones).

and if I had stuck with the 6670 the whole thing would have been for less than what the shop quoted them to replace 2gb ram with 2gb ram and a new mobo.

Their old graphics card was a geforce 8500. It is goosed and IMO is what caused their blank screen. Not the mobo. But the shop told them it was the mobo, and they think the guy who told them this, was a nice guy, so they told me they wanted the mobo replaced.
What can you do? ha ha

Anyhow, The 7770 was cheap on here yesterday and figured that as its latest tech I would get it and so they could get 8 years out of it like they did with the 8500.

I'll just charge them the 35 quid that the 6670 would have cost. I'll take the hit. They are a lovely couple.
So as you can see, the last thing I want to do is replace a psu because of a nice turn I have done them. I could scale back how much I oc the cpu if its needed but would rather not.

Usually I would just buy an antec 900w gamer psu and be done with it, but I cant with this low tech build.

So please can anyone do the maths in relation to what it needs to power including cpu oc, in relation to the listed amps on the psu.
 
I think the bigger barrier to a higher oc is going to be the G41 board. They typically have a reduced power delivery and are designed mostly with stock in mind. So with the added load the vrm's will get toasty and less efficient with more unstable power, meaning higher volts to sustain lower oc's.

In terms of the PSU it should be more than capable for either a 6670 or 7770 with about 380w at 12v if the ratings are to be believed.
According to these sites the difference between the 6670 and 7770 is in the region of 20-30w more under gaming load and the same at idle/monitor type load.
http://www.techpowerup.com/reviews/Club_3D/HD_7750_Low_Profile/26.html
http://www.anandtech.com/bench/Product/613?vs=536
http://www.hwcompare.com/11886/radeon-hd-6670-oem-1gb-vs-radeon-hd-7770/
(the anadtech site is sytem power while the techpower has the rest of the system estimate and subtracted to give gpu power draw.)

If you have a power meter (about a tenner if you don't and quite useful to have around) you could measure at the wall to give you a good idea of how you're taxing the psu.

Ocuk sell one http://www.overclockers.co.uk/showproduct.php?prodid=NW-003-EN
but so should a high street shop that sells electricals.
 
I have a G41 board in my home office PC with a Q6600 @ 3Ghz which has spent the last couple of years encoding, light gaming and general usage. The board was a cheap MSI DDR3 variant to reuse the Q6600 out of my old gaming PC.

Rock solid throughout that time.

Should be no issues with power for a E6750 if it can OC a Quad, though I only need to run the FSB @ 1333Mhz. I don't know how stable the G41 would be around 1600Mhz but worth a shot.

AD
 
If you're building for a lovely old couple, I'm sure they're not going to care whether their CPU is running at 3.2 or 3.4GHz ...

What they will care about is how long it will last, how noisy it is, whether it crashes or not and how 'nice' and easy it is to use. Leave it stock

Drop the overclocking, use the old PSU, return the 7770 and corsair RAM, replace it with the cheaper 6670 and 4GB of any brand RAM.

Buy them a nice keyboard, mouse, screen and be done with it.
 
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Nickjf20 said:
If you're building for a lovely old couple, I'm sure they're not going to care whether their CPU is running at 3.2 or 3.4GHz ...

What they will care about is how long it will last, how noisy it is, whether it crashes or not and how 'nice' and easy it is to use. Leave it stock

Drop the overclocking, use the old PSU, return the 7770 and corsair RAM, replace it with the cheaper 6670 and 4GB of any brand RAM.

Buy them a nice keyboard, mouse, screen and be done with it.
Click to expand...

Its false economy doing it that way. They dont have much money and so it makes more sense getting the best possible things that can be used in a future build. That way they dont have to fork out for a new gpu, ram etc.

At the minute I will use the G41m and E6750 but all the other parts can and will be used in an 1155 chipset.

The 7770 was cheap and will be more adaptable in the future than the 6770.
Ive double checked the original psu with a bar code scanner and it is not an ocz after all. It is a £12.88 Oem job that I wouldnt trust to power a toaster so I have binned it.

I'll stick with the FSP, buy a voltage tester and see how it copes when I plug in graphics card, change volts on RAM and then start OCing the cpu.

I like to have at least 30% spare and so if it doesnt, I will just have to get a better one.

It has to be fast because they use the internet a lot and get frustrated with screen hangs or buffering halts when watching movies etc.

As long as I keep temps down it should be quiet enough.
 
Festisio said:
Don't you think their internet bandwidth is going to be the bottleneck there, not whether they're using a 6670 or a 7770...
Click to expand...

In what way?
They dont have the greatest connection that is for sure. The pc shouldnt though.
3.8 ghz cpu, 8gb 1333 ddr3 and a 7770 should all suit each other.
 
OP, have you a Japanese Electronics and Dangerous Toy Company PSU or something? ;)
If it is, then I can only recommend removing it and fitting a well known brand such as Corsair, Coolermaster etc etc.
 
howayman said:
In what way?
They dont have the greatest connection that is for sure. The pc shouldnt though.
3.8 ghz cpu, 8gb 1333 ddr3 and a 7770 should all suit each other.
Click to expand...

Well if they currently experience buffering then a souped up PC aint going to stop that happening. Since you can quite easily stream 1080p content on absolutely crap PCs with no buffering if the connection is good enough.

I'm sure the PC will be great for them. They'll probably be the best geared OAPs in all of the Uk!
 
Way to go OP, you crack on ripping off the elderly :p

7770 is total overkill for old age pensioners who apparently only browse the web. Onboard would have probably done, failing that a cheap passive video card £15-£25 will play 1080P video just fine.

What were you thinking :confused:
 
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