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Is this PSU sufficient for this graphics card?

Last response: in Graphics & Displays
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November 15, 2012 8:21:15 PM

I want to get an EVGA GeForce GTX 550 Ti 1GB. It calls for a minimum wattage of 400 or greater for a power supply. I have a 460w PSU from Dell. However, it also calls for 24 amps on the 12-volt rail. I believe I have three 12volt rails and none of them go over 20. Here's what it says:

12.0vA - 18.0A
12.0vB - 16.0A
12.0vC - 8.0A
The total wattage for them is a maximum of 385w.

I have no idea if my power supply is sufficient. If you need more than 24 amps on one rail, then I know it isn't, but I don't know if you add them all together or what... I have a completely stock computer. No add-ons.
November 15, 2012 8:28:59 PM

Unless you have a good deal on the 550ti, don't get it. The sapphire radeon 7750 goes for $100 and doesn't require a power connector and will run super great on that power supply. It only pulls about 70w. They have almost identical performance.
November 15, 2012 8:32:47 PM

Can you post the specs for your Dell please?
Related resources
November 15, 2012 8:43:24 PM

Here's what I found on NewEgg. Which one would be best?

http://www.newegg.com/Product/Product.aspx?Item=N82E168...

or

http://www.newegg.com/Product/Product.aspx?Item=N82E168...

I looked at the details between these and the 550, and the specs don't seem to be anywhere near the same...

Effective memory clock for 550 is over 4000 Mhz, while the 7750 is just over 1000... All the clockings seem lower than the 550.. I don't know much about computers, but doesn't this mean that the 550 would perform better?

My computer specs are:

Dell XPS 8500
Intel i5-3350p clocked @ 3.1Ghz
8GB of DDR3 RAM
460w PSU
One DVD drive
November 15, 2012 8:50:17 PM

If the maximum wattage for the combined three +12 Volt rails is 385W then you have 32.083 amps.

It's very simple to figure out. 385/12 = 32.083
November 15, 2012 8:59:43 PM

Dell uses pretty good power supplies in their computer builds (especially XPS),so I would suggest by looking at the specs some of these computers come with a reference so I would recommend this 7770

http://www.newegg.com/Product/Product.aspx?Item=N82E168...

not to bad on price although this one does take up 2 slots which shouldn't be a problem.

Also heres a chart if you want to see where graphics card stand in graphics performance over all

http://www.videocardbenchmark.net/high_end_gpus.html
November 15, 2012 9:02:46 PM

testedtwice said:
Here's what I found on NewEgg. Which one would be best?

http://www.newegg.com/Product/Product.aspx?Item=N82E168...

or

http://www.newegg.com/Product/Product.aspx?Item=N82E168...

I looked at the details between these and the 550, and the specs don't seem to be anywhere near the same...

Effective memory clock for 550 is over 4000 Mhz, while the 7750 is just over 1000... All the clockings seem lower than the 550.. I don't know much about computers, but doesn't this mean that the 550 would perform better?

My computer specs are:

Dell XPS 8500
Intel i5-3350p clocked @ 3.1Ghz
8GB of DDR3 RAM
460w PSU
One DVD drive


http://www.anandtech.com/show/5541/amd-radeon-hd-7750-r...
They perform similar, and the 7750 consumes much less power.
Go to the power consumption page of that review and you'll see.
November 15, 2012 10:39:23 PM

So would my PSU have enough power to run the MSI Radeon 7770? I don't know what to choose. There are so many of them. :\ I just want to be able to play games like The Sims 3, GTA IV, Skyrim, etc.
a b U Graphics card
November 15, 2012 10:50:00 PM

for the money, HD 7770 totaly worth the cost. Its performance is great and dosnt us much energy
But the problem is not the card or its performance, it is its consume. An HD7770 will run, but in some time a cheap PSU will most likely fry itself for not powering the parts in any appropriated way. And also taking parts with it into the dead zone.


I suggest you, get the HD7750 for that PSU, or if you have the money, buy a well branded PSU and use an HD7770. an Antec 430 PSU will be more than enough.
November 15, 2012 11:00:41 PM

horaciopz said:
for the money, HD 7770 totaly worth the cost. Its performance is great and dosnt us much energy
But the problem is not the card or its performance, it is its consume. An HD7770 will run, but in some time a cheap PSU will most likely fry itself for not powering the parts in any appropriated way. And also taking parts with it into the dead zone.


I suggest you, get the HD7750 for that PSU, or if you have the money, buy a well branded PSU and use an HD7770. an Antec 430 PSU will be more than enough.


Dell PSUs are actually pretty good. It could run a 7770 assuming it has a PCI-E connector.
a b U Graphics card
a b ) Power supply
November 15, 2012 11:11:01 PM

Get the 7770. It draws 45W less than the 550 and have better DX11 performance than the 550. The 7750 draws 10W less than the 7770 but has lower performance.

http://www.tomshardware.com/reviews/radeon-hd-7770-7750...

In short, get the 7770. It doesn't require power jumpers, it takes all its power from the board connector.
November 15, 2012 11:52:20 PM

babernet_1 said:
Get the 7770. It draws 45W less than the 550 and have better DX11 performance than the 550. The 7750 draws 10W less than the 7770 but has lower performance.

http://www.tomshardware.com/reviews/radeon-hd-7770-7750...

In short, get the 7770. It doesn't require power jumpers, it takes all its power from the board connector.

It requires a 6-pin.
a b U Graphics card
a b ) Power supply
November 16, 2012 12:01:05 AM

rambisco said:
It requires a 6-pin.


Right you are. It's the 7750 that doesn't require a connector. But the power difference is but 10W.
a b U Graphics card
a b ) Power supply
November 16, 2012 12:49:27 AM

The GTX 650 Ti performs better than the 550 Ti but consumes less power.

GTX 650 Ti: 100 Watts - http://www.guru3d.com/articles_pages/msi_geforce_gtx_65...

GTX 550 Ti: 140 Watts - http://www.guru3d.com/articles_pages/geforce_gtx_550_ti...

HD 7750: 43 Watts || HD 7770: 86 Watts - http://www.guru3d.com/articles_pages/amd_radeon_hd_7750...


Your PSU which can deliver 385W on the 12V rail will be more than enough to power any of the said cards. If you have a basic gaming PC and don't overclock, you will be fine. You can even go the HD 7850 with your PSU.
a b U Graphics card
November 16, 2012 1:23:47 AM

For reference, the 6 pin is capable of delivering 75w at 12v. That is 6.2 amps. So the card can't pull more than 6 amps from the 12 rail you are connecting it to. Add in the 150w the bus provides, 12 amps, you get a max draw of 18a at 12v. As long as you use a different 12v rail for the 6 pin than the rest of the system uses, which it should, you will have no issues with any card that uses a 6 pin connector.

Go with the 7770 if budget allows. the 7770 runs Skyrim, everything max 1080p at over 30 fps.
November 16, 2012 1:58:32 AM

My power supply has two unused 6-pin PCIe cables tucked away. Does that mean it can run more power for a video card?
a b U Graphics card
a b ) Power supply
November 16, 2012 2:13:52 AM

This requires two 6-pin power connectors:
HD 7870 System Power Consumption: 308W -- http://www.guru3d.com/articles_pages/msi_radeon_hd_7870...

But I would go for the GTX 660 or an HD 7850. They only require one 6-pin power connector. Both are great for 1080p gaming at high to ultra settings.
November 16, 2012 3:13:13 AM

Alright. I'll go with this card then. If this doesn't run GTA IV, then I'm just going to forget about it. I've already spent about $275 in the past three years trying to get that game to run well. Haha. Thanks for your time, everybody. You've been a huge help! :D 
November 16, 2012 4:43:48 PM

testedtwice said:
Alright. I'll go with this card then. If this doesn't run GTA IV, then I'm just going to forget about it. I've already spent about $275 in the past three years trying to get that game to run well. Haha. Thanks for your time, everybody. You've been a huge help! :D 


In the case of this game you can have pretty decent hardware (I have i5 2500k and a 6870) and the game(GTAIV) will still run like crap because the programmers did the absolute worst job of porting the game from console to pc.
November 17, 2012 8:26:32 PM

The game actually plays pretty well with everything set on high for me (with my current EVGA GeForce GT 640). Perhaps a video card upgrade will help. If not, I'll at least be able to play the Sims 3 (hopefully on high). :\
November 17, 2012 9:56:39 PM

An XPS 8500 can be configured with a 7870 without a problem on dell's website and it only has 1 model of PSU. Thus, you should be fine with any card under 7870. In addition it's a 460w PSU and really can run a 7970 as many have done since Dell PSU are known for being high quality.
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