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450w PSU enough for 6870+i5-2400?

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April 21, 2012 1:12:22 AM

I have three main concerns:

1. Is a 450w PSU enough for the whole system with those 2 parts inside my dream system? Even in load while playing the awesome new games with all eye candy on? I've checked on the popular PSU calculator site, eXtreme power supply calculator, and it says that the recommended wattage is 475w. I'm skeptical.

Here's the input:

i5-2400
HD 6870
4gb ddr3
1 250gb IDE 7200rpm
1 250gb SATA 7200rpm
120mm fan
3 USB devices
100% peak load
25% capacitor aging

minimum wattage is 425w
recommended wattage is 475w

Also, what should usually be the peak load of a system like this, most especially when gaming? I heard it should be way lower.

Oh, yes, I call it my dream system because I'm still waiting for my brother's moolah for me to buy a new PC... this time for some gaming. It sucks having a 5 year old Pentium 4 PC. :pfff: 

2. Does running your system at 100% peak percentage going to wear out the PSU faster? I asked this because what if the system runs at 100% and then it's tearing down faster then it blew up.

3. Is 450w enough for 560 Ti?! Same specs but with this GPU.

HERE'S THE PSU, Antec VP450P

It's praised here:

http://www.hardwaresecrets.com/article/Antec-VP450-Powe...

Golden. It's reaaaaal good for its price and it's available locally at my area! :bounce: 

Anyway, that PSU is my only option and I can't order online because I don't know how and I'm from a 3rd world country.

More about : 450w psu 6870 2400

April 21, 2012 1:16:25 AM

450 watts at best is on the low side.

Go with a good PSU, something from 500 watts to 650 watts depending on prices and availability; Corsair, Seasonic, Antec.

The PSU is at the heart of the system. Go with a reliable brand!
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April 21, 2012 1:23:10 AM

It will work so long as it's a decent 450watt PSU with a good +12v rail.
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April 21, 2012 1:47:04 AM

One of my systems has an OC'd Q9550, 4 GB RAM, a GTX260 - a card with similar power requirements to yours, a Gigabyte EP45-UD3P motherboard, 3 hard drives and an optical, and a Soundblaster card all powered by a Corsair 750TX.

Running 3 instances of Prime95 to load the CPU and 3DMark06 to load the 4th core and the GPU, it pulls 375 watts from the wall as measured by my Kill-a-Watt meter. Figuring 80% PSU efficiency, the system pulls 300 watts from the PSU.

You will not have a lot of reserve power, but your Antec should power your system without any problems.
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April 21, 2012 1:58:14 AM

wow OPs Radeon HD pulls 30watts less than a vanilla non core 216 model GTX 460 and 50watts less than the core 216 GTX 260 so OP will be singing in the rain worry free with his PSU.
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April 21, 2012 3:45:03 AM

that 430W psu should have like 35 or something amps
for the requirement of the 6870 it should be enough. and since your using a i5 2400 so no overclocking will be there, and should also be enough to power up your system. but it will be so tight,

also used that extreme ps calcu, at 100% load with a blue ray dvd drive, and with a high end mobo, It came with 408W,

but you should go with a 500-600W also consider the deteriorating part.


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April 21, 2012 3:49:12 AM

Tavo_Nova said:
that 430W psu should have like 35 or something amps
for the requirement of the 6870 it should be enough. and since your using a i5 2400 so no overclocking will be there, and should also be enough to power up your system. but it will be so tight,

also used that extreme ps calcu, at 100% load with a blue ray dvd drive, and with a high end mobo, It came with 408W,

but you should go with a 500-600W also consider the deteriorating part.

OPs system will pull 300watts from the PSU so we will say call it 350watts to be safe OP will have no power issues his PSU is and will bejust fine. My have people ever become paranoid with PSUs now in days as of late.
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April 21, 2012 3:58:02 AM

7970 FTW said:
OPs system will pull 300watts from the PSU so we will say call it 350watts to be safe OP will have no power issues his PSU is and will bejust fine. My have people ever become paranoid with PSUs now in days as of late.



actually his system should be pulling exactly 250-375W (

I own lots of psu together with system both to low end to extreme high end. so far based on what it's showing on my mid range system (close to mid range)

i5 2400
H67 msi mobo
2x2gb ram
single sata hdd seagate 500gb 7200
sapphire hd 6870
antec 300 (all fan slots filled with noctua fans)
corsair cx500 v2

this is when gaming on bf3

it should be close to his system usage (on what watts it needs)

so yeah even a 430 cx corsair psu is great for it, but if he doesn't plan to upgrade in the next 3-4 years, he should consider a 500W.

but if he already have his psu then it's ok ^_^ no harm done,
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April 21, 2012 4:11:18 AM

Tavo_Nova said:
actually his system should be pulling exactly 250-375W (

I own lots of psu together with system both to low end to extreme high end. so far based on what it's showing on my mid range system (close to mid range)

i5 2400
H67 msi mobo
2x2gb ram
single sata hdd seagate 500gb 7200
sapphire hd 6870
antec 300 (all fan slots filled with noctua fans)
corsair cx500 v2

this is when gaming on bf3

it should be close to his system usage (on what watts it needs)

so yeah even a 430 cx corsair psu is great for it, but if he doesn't plan to upgrade in the next 3-4 years, he should consider a 500W.

but if he already have his psu then it's ok ^_^ no harm done,

If you don't need to upgrade I always don't unless it is necessitated and justified however I can always recommend having a backup PSU on hand just in case and foe testing so it might be something OP will consider even though his current PSU it completely adequate for his situation and build.
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