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Can my PSU handle this GPU?


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12 replies to this topic

#1 AlexMERCER77

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Posted 20 July 2014 - 01:19 AM

These are my PC specs:

 

1. Operating System: Microsoft Windows 8.1 Enterprise 32-bit

2. Motherboard: ASUSTeK COMPUTER INC. P8B75-M
3. Processor: Intel® Core™ i5-3470 CPU @ 3.20GHz (Physical: 4, Logical: 4)
4. Memory: 4.00 GB
 
And the PSU :   +12V1 -> 15A, +12V2 -> 17A.
 
I'm planning to get an HD 7750, and I wonder if this PSU will be good enough to handle it safely without any possible risks.
And I'm not planning on getting a new PSU due to financial problems. 
 
Quick reply would be much appreciated.
 
Regards.
  


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#2 AlexMERCER77

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Posted 20 July 2014 - 01:28 AM

Also, will it handle GTX 650?



#3 Ezzah

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Posted 20 July 2014 - 01:51 AM

What PSU is it? And what wattage does it provide, or claim to?


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#4 AlexMERCER77

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Posted 20 July 2014 - 03:29 AM

It doesn't have a Company name on it, apparently  :mellow:  But it claims to be a 650W one.



#5 Ezzah

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Posted 20 July 2014 - 04:32 AM

If it claims to be 650W, then it should be more than enough for the GTX650, no problems.


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#6 Platypus

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Posted 20 July 2014 - 06:43 AM

The maximum power that can be supplied from the 12V rails alone is just over 380W.

 

The main thing you need to allow for when your PSU is not a single rail design is how much power is already being drawn from each rail. Neither card is particularly hungry - an HD 7750 is efficient and requires peak power of 43W (3.6A) and the GTX 650 64W (5.3A). However if for example the system is wired so up to 12A is already able to be drawn from +12V1, running the GTX 650 from that rail could overstress it. If your PSU doesn't say which connectors use which rail, it's hard to know how balanced the power distribution will be.


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#7 AlexMERCER77

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Posted 20 July 2014 - 09:57 AM

Also, another question, I have a mini-tower case with no fans at all. Will the HD 7750 or GTX 650 operate safely? I wouldn't mind fan-noise at all.



#8 Ezzah

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Posted 21 July 2014 - 02:06 AM

The GTX's and Radeons are all non-passive, so they have their own fan, and should be able to operate with a fanless tower. However, I would suggest investing a few bucks to integrate fans, they really help.


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#9 AlexMERCER77

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Posted 21 July 2014 - 10:51 PM

How can I know if my PSU is really 650 Watt? It only has one port for connecting it to a power source, no ON/OFF switches like I've seen in other PSUs. It's sticker says 650W though.



#10 Ezzah

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Posted 21 July 2014 - 10:55 PM

It won't output 650watts unless you suddenly require a lot of power, otherwise, it will provide somewhere around 500ish constantly, and spike 650watts on maximum.


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#11 Platypus

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Posted 22 July 2014 - 05:08 AM

The true wattage rating of a PSU can be considered to be the sum of available power on all the supply rails. If there isn't a label giving all the current ratings, however many +12V rails, +5V, +3.3V and any negative rails present, then it will be unclear what its correct rating is.


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#12 AlexMERCER77

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Posted 25 July 2014 - 06:15 AM

And will I have to under-clock the Radeon HD 7750 or GT 640 on that PSU? Or will it run fine? Or is it that I'll be able to over-clock?



#13 dikbozo

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Posted 25 July 2014 - 08:04 AM

As the 7750 does not require any power beyond that supplied by the PCI Express slot it is inserted into, you most certainly don't need to do anything beyond installing said card and rebooting to install the driver. No under clocking, volting or additional fans or even keeping your fingers crossed. The GT 640 uses a bit more power than the 7750 but is a less capable card (slower). If the price is close the 7750 offers better performance and uses less power.






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