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Radeon HD 6450 on 250w PSU?

Last response: in Graphics & Displays
June 8, 2012 10:41:45 AM


I'm preparing all the things I need to buy (Already bought motherboard - ASUS M5A78L-M LX V2) which includes Memory, CPU, and the GPU. The GPU that I had in mind was the AMD Radeon HD 6450, although AMD states on their System Requirements page for this card that a "400w PSU is recommended"

I have a 250w Delta Electronics PSU which came bundled with the Novatech slim case I bought (I beleive it is the TFX12V form factor), and this raises a problem seeing as the recommended PSU wattage is 400w.
I acknowledge that the amp(er)age has a mmajor part in this, and so here is the description on the PSU:

Model: DPS-250AB-18 E REV: 02 F
Input: 115 ~/ 7A, 230V ~/ 4A
Output: +12V1 === / 8A, +12V2 === / 14A,
+5V === / 18A, -12V === / 0.3A,
+3.3V === / 18A, +5VSB === / 2A,
+3.3V + +5V 115W
+3.3V + +5V 115W

...or if you prefer an image:

Could you advise me whether my PSU could support this GPU or not and whether another GPU (Radeon HD 5450, say) could be supported under my circumstances.

PS. By the way, I tried this PSU calculator - eXtreme Power Supply Calculator, and I entered in the 6450, my hoped for CPU (Athlon II X2 250), Hard Drive, Memory, etc., and it output a minimum wattage of 179w and a recommended wattage of 229w. The Newegg PSU Calc outputs 224w, and Asus' PSU Calc (My Motherboard's manufacturer) outputs 250w - What could this mean!?


More about : radeon 6450 250w psu

a c 289 U Graphics card
June 8, 2012 10:48:22 AM

It will work. HD 6450 barely requires power.
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a c 289 U Graphics card
June 8, 2012 1:18:35 PM

I am 100% sure. It consumes 26 watts of power at PEAK.

a c 189 U Graphics card
June 8, 2012 1:52:20 PM

It should work perfectly fine.
June 8, 2012 1:59:05 PM

What about amperage? Is that important?
a c 289 U Graphics card
June 8, 2012 2:00:17 PM

Wattage = Voltage * Amperage.

So if it uses 26 watts from 12 volt rail, it will use 2.17 amperes.
June 9, 2012 7:37:44 PM

So why does AMD say that I need a 400w PSU? Is it for optimal performance?
a c 289 U Graphics card
June 9, 2012 7:41:18 PM

To be save. If some one who uses 10 hard drives running off their 300 watt power supply tries to run the card, they would have no right to sue AMD if his power supply explodes. It is fool-proof protection.
June 9, 2012 7:46:22 PM

Ok, thanks!
Just to be sure, I am going to get:
- An AMD Athlon II X2 250 for CPU
- A Sapphire Radeon HD 6450 GPU
- 8GB (4x2) of Crucial Ballistix Sport memory
- A DVD/CD-RW Combo drive

Would these be too much for 250w?
a c 289 U Graphics card
June 9, 2012 7:47:16 PM

Not at all, 250w will handle it all easily. What will you use the system for? 8 GB of RAM seems like overkill though.
June 9, 2012 7:49:14 PM

Would any of the components become bottlenecked?
a c 289 U Graphics card
June 9, 2012 7:54:27 PM

Not really. But you seem to be buying very low end CPU while paying a lot for RAM. It seems strange to spend more money for RAM than CPU unless you really have 40+ programs open at the same time. I don't know that though, you didn't tell what you will use the PC for :) .
June 9, 2012 8:00:53 PM

Well, I was planning to install Ubuntu (Linux) - My profile pic - onto my machine, the primary use of which would be playing online 3D games and probably playing Windows games through Crossover (A compatibility layer), as well as using the PC as an all-purpose thing for browsing, troubleshooting, etc.
Though I already ordered the RAM. Whoops.
a c 289 U Graphics card
June 9, 2012 8:07:55 PM

Did you order HD 6450 already? It's a very slower graphics card not fit for gaming at all. It's made for watching movies. I'd suggest at least HD 6670 or even HD 7750 if you can afford it. They would both work with said power supply.
June 9, 2012 8:22:25 PM

Oh ok. One of the major disadvantages of my case of which I currrently have is the fact that i need a low profile (LP) bracket in order for the card to fit into the case itself. I looked at the 6670 and it seems that the card is too big and I cannot find an LP bracket to go with it. The 7750 is, quite simply, out of my budget (£30-40 - £50 would be kind of pushing it).
Are there other Nvidia alternatives?
June 9, 2012 8:44:25 PM

My budget is £30-40! How about the HD 6570? That's more expensive, and therefore must be better, right? It's also about £40.
a c 289 U Graphics card
June 9, 2012 8:49:03 PM

HD 6570 is way better than HD 6450. If it's the best you can afford, that's what you should buy.
June 9, 2012 8:55:38 PM

I tried it on the eXtreme PSU Calc, and it surpassed the 250w point, specifically, 259w. I'm pretty worried that this is unsafe, so I think I'll go with the 6450.
a c 289 U Graphics card
June 9, 2012 9:13:41 PM

It's safe.
a c 289 U Graphics card
June 9, 2012 9:33:29 PM

I'm sure. On tom's hardware load tests, it didn't surpass 126.0 watts during 100% load test:
June 10, 2012 11:34:52 AM

I tried again the 6570 in the PSU Calc, and it output 239w! That's good.
Now, I've found the MSI R(adeon)6570-MD1GD3/L(ow)P(rofile) Graphics Card for £45, and it does, as the name suggest, include low-profile brackets.
I'll probably get that now.

Also, my case has raised ridges with holes in them where it appears the screws are supposed to go. The case didn't come with any stand-offs, only the mounting screws.
So, should I mount the MB simply on those raised ridges?

Also, The PSU is 230V, but my power connector cable with the three holes says 250V on the underside of the end of the cable - is this OK to use?
a c 289 U Graphics card
June 10, 2012 11:41:20 AM

230V is input voltage. That's what socket on the wall operates at. 250W is output wattage. It's what power the PSU can output. Don't confuse the two :) .

You should put your motherboard on the raised ridges, then screw it to them. Check this video:
a c 289 U Graphics card
June 10, 2012 12:16:52 PM

It means the cable can carry 250 volts without melting. Set the switch thing to 230V, as that's what your socket gives you (you live in UK, right?).
June 10, 2012 12:46:20 PM

Yup, OK. Now I'm psyching myself up on installing the MB as I'm faced with all these shenanigans about ESD and grounding myself.
What I've gathered:
- Touch exposed metal of the case while (not?) plugged in frequently.
- Put a bucket of water or humidifier in the room.
- Don't work on a carpet.
- Don't move.
June 10, 2012 12:50:41 PM

And yes, I live in the UK.
a c 289 U Graphics card
June 10, 2012 12:54:37 PM

I would not put bucket of water in the room, you might trip over it and spill it :lol:  But yea, working on a carpet is a bad idea and just touch the case whenever you want to pick up new components.

The video I linked shows you exactly how to mount the motherboard. Make sure to match the mounting screws.
June 10, 2012 10:05:17 PM

Aaaand the MB is installed! Took me 11 hours, but oh well :D  - I am almost certain that I destroyed it with ESD.
Now let the delivery of components begin.

BTW, can I select best answer on these forums?
a c 289 U Graphics card
June 11, 2012 5:00:37 AM

Glad you made it :D . 11 hours - that's quite an achievement!

You should be able to select the best answer if a moderator changes your topic to 'question'. Next time, when making a topic, make sure to select 'question' type instead of discussion.
June 12, 2012 10:12:46 PM

Best answer selected by Marcappuccino.