psu PSU too small??

[iHDCool]

Hello guys. So i got an HQ compaq 8000 elite sff pc (its small factor pc) and i recently upgraded my gt 210 to 1050 ti msi 4gb low profile. I read that the card needs a minimum of 300W psu, the problem is my pc has a stock weird looking 240w psu that can't be change bcuz, its weird looking lol... I got a core 2 quad q9650 3ghz, 4gb of ram ddr3 1333mhz, 250gb of HDD Sata 3 6gb/s 7200RPM and mobo is Hewlett and Packard XU1 Processor. Now is the psu too small? Bcuz some games are playable, and recently i tried GTA V, it's laggy as FUCK, from 60 solid fps, to 5-6 fps and then crashing the game. Is it my PSU not giving enough power? I thought that it's nuff cuz 75w is all it needs. Thanks in advance. 

[Jurrunio]

GTA 5 stutters because of 4GB RAM. Get 8 or more and the game should run a lot smoother.

 

240w PSU is enough. These Dell machines are tough as bricks.

[iHDCool]

Ahm, i was wondering about the 4gigs of ram too, thanks tho, btw its HP  

[mariushm]

nVidia says 300w so that you won't buy the crappiest power supplies out there.

 

The card itself doesn't use more than 75w so as long as the rest of your components don't use more than 165w then you're fine.  HINT : the rest of your pc uses maybe up to 120 watts. 

[iHDCool]

Well, CPU alone says 95w, and idk if the rest of the PC can use more then an additional 50w 

[mariushm]

No, that's the TDP (thermal limits), doesn't mean the cpu itself will use up to 95 watts. But in this case yeah, the cpu probably uses up to 100w when doing something very cpu intensive.

 

Most reviews say 150 watts for a whole system (measured at the wall), here's an example: https://www.techspot.com/article/1039-ten-years-intel-cpu-compared/page6.html

 

Note that's it's a gold efficiency power supply but one rated for 750w which means 150w is somewhat below 20% of its load, so the psu may be less than 90% efficient there.

 

Anyway assuming a 85-90% efficiency power supply you're looking at around 130w actual power consumption of the whole system.

Motherboard uses 10-15w , hard drive averages 6 watts, memory 2-3 watts per stick of memory, fans about 5w (2w per fan) .. you're down to around 100w for the cpu.

 

The 240w rating of the power supply is what the psu can give to all components, not what it can take from the mains socket.  The reviews show what the psu takes from the mains socket.

[xentropa]

In my experience, usually insufficient power leads to a reset, or a whole system freeze.

[iHDCool]

Eh, well okay, lets say the gpu uses 75w at max load, it hasnt reached that yet, 1 sata III 7,2krpm 250 gb WD, 1 small-ish cpu fan, a random mobo, 2 sticks of 2gb ddr3 ram, 1 dvd/cd combo and mice/keyboard. How much power can all that use? 

[mariushm]

It will average maybe up to 160-180 watts (in total)  because the processor will not run at 100% all the time while you're gaming, and the video card will also not run at 100%.