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Performance drop is it PSU or CPU issue?

Last response: in Systems
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June 18, 2014 12:09:24 PM

Hello!

I have a PC
MOBO - 965P-DS3 - Gigabyte
CPU - Intel Core 2 Duo E6600 2,4 GHz
GPU - GeForce GTX 660 - ASUS
RAM - 4 sticks by 1 GB
PSU - 500W - White energy http://www.whitenergy.com/Zasilanie_PC/Zasilacze_ATX/PC...

Yesterday I installed GTX 660 (replaced GT 220) and I tried my games without changing settings and FPS dropped drastically.

So is it PSU fault? Technically GTX 660 needs 450W as manufacturer states.
Or maybe it's CPU and MOBO incompatible/to weak for GPU?

P.S. I'm planning to buy MOBO - MSI H87 G41 PC Mate; CPU - i5 4440 to replace my current.
P.S.S. I have uninstalled my old video drivers through Display Driver uninstaller through safe mode and installed fresh ones.

Thank you!
a c 144 ) Power supply
a c 333 à CPUs
June 18, 2014 12:21:24 PM

I suspect your psu might be a cheap one that may not deliver advertised power.
Look on the data plate and see how many amps it can deliver @12v. A GTX660 needs 24a.
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June 18, 2014 12:27:43 PM

geofelt said:
I suspect your psu might be a cheap one that may not deliver advertised power.
Look on the data plate and see how many amps it can deliver @12v. A GTX660 needs 24a.


On PSU box there is a table:
+12V1 - 18A; +12V2 - 18A; -12V - 0,5A; +5V - 36A +3.3V - 28A; +5VSB - 2,5A

Though I don't know what is difference between V1 and V2 they are both showing 18A so I guess I need to add PSU to my buy list.
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a b ) Power supply
a b à CPUs
June 18, 2014 12:31:10 PM

Clumorelo said:
geofelt said:
I suspect your psu might be a cheap one that may not deliver advertised power.
Look on the data plate and see how many amps it can deliver @12v. A GTX660 needs 24a.


On PSU box there is a table:
+12V1 - 18A; +12V2 - 18A; -12V - 0,5A; +5V - 36A +3.3V - 28A; +5VSB - 2,5A

Though I don't know what is difference between V1 and V2 they are both showing 18A so I guess I need to add PSU to my buy list.


Yea the GTX 660 only has one 6 pin connector so you need a single rail with 24 amps on it.
Here is a nice one for pretty cheap (45a on the 12v rail):
http://www.newegg.com/Product/Product.aspx?Item=N82E168...
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a c 144 ) Power supply
a c 333 à CPUs
June 18, 2014 12:49:41 PM

V1 and V2 are artificial UL safety boundaries. But 18a. +18a does not necessarily indicate you have 36a, but likely less. Unfortunately your psu does not give any indication of what the total capacity might be.
The fact that the lesser voltages like +5v and +3.3v show high amperage values tells me that this is an older psu that does not deliver +12v amps where today's cpu and gpu units need it.

Can you borrow a good psu and test with it?
I would hate to tell you the psu is the cause when it really might not be.

Or, at least buy a unit from a place where a return will not cost you much.

If you do decide you need a new psu, buy only a quality unit. Seasonic and XFX are good. Here is a list of tiered psu's sorted by quality:
https://community.newegg.com/eggxpert/computer_hardware...


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