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HD 4870 PSU

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  • Radeon
  • Cooler Master
  • HD
  • Power
  • Graphics
  • Product
Last response: in Graphics & Displays
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June 27, 2008 1:47:25 PM

hey guys, i have a cooler master extreme power 500w PSU
http://www.coolermaster.com/products/product.php?langua...

was wondering whether it could run the new hd 4870
my other specs are:

e6550
ga-p35-s3l
1 x 160 gb HD
2gb ddr2 667mhx ram
and the usual dvd-rw drive

thx for the help

More about : 4870 psu

June 27, 2008 2:03:40 PM

That would be the case if you could anticipate that a CoolerMaster PSU would be good for its rated output. I'm not sure I would.
June 27, 2008 2:08:41 PM

Your PSU has 1 6-pin PCI-E connector and the 4870 requires 2, I would get a new PSU.
Related resources
June 27, 2008 2:15:07 PM

1) That's a good suggestion but I've yet to see the specs from ATI or Sapphire, HIS, or Visiontek where they give more info than:

Quote:
500 Watt or greater power supply with two 75W 6-pin PCI Express® power connectors recommended (600 Watt and four 6-pin connectors for ATI CrossFireX™ technology in dual mode)

June 27, 2008 2:19:06 PM

is it possible to use an adapter?
June 27, 2008 2:22:29 PM

And keep in mind if you ever want to crossfire 2 4870's later on you'll need a 650W power supply with 4 6-pin PCI-E connectors.
June 27, 2008 2:23:10 PM

When you hook up the adapter are you connecting it to the rail that supplies your CPU? or your motherboard? would you end up connecting it to the rail that supplies your hard drives and if so would it overload that rail leading to possible drive failure and data loss? which molex is connected to which rail? and how do you determine which rail has enough current left over to run the adapter?

Your always better off having enough connectors rather than using adapters. There is a reason the PSU was only built with one.
June 27, 2008 2:34:39 PM

the convertors are hook to the rails for the peripherals which are currently not in use.. i think
June 27, 2008 2:41:03 PM

ausch30 said:
When you hook up the adapter are you connecting it to the rail that supplies your CPU? or your motherboard? which molex is connected to which rail? and how do you determine which rail has enough current left over to run the adapter?

Your always better off having enough connectors rather than using adapters. There is a reason the PSU was only built with one.

I would totally agree with this if the card really drew the full amount of power from both PEG connectors, but the TDP is only 160W. 75W from the PCIe slot + 150W from the two PEG connectors = 225W, so there's plenty of room to spare. I bet an adapter would work.

But if you're overclocking and you want to be absolutely sure your PSU is strong enough a Corsair VX550 would be a good choice.
June 27, 2008 2:46:49 PM

thx.. what i am now worried about is would i have enuff amps on the 12v rails to run it.. any idea?
June 27, 2008 3:01:48 PM

I doubt it. Cooler master hides the importan info, but that PSU has 2 16 amp 12v rails. From what I have heard it's short on 12v power and in this PSU's case don't expect that to equal 32 amps. It may be a total of 22 amps, or somewhere in between.

If it had been the Antec Earthwatts 500W (on sale $50), with a max combined 12v of 34 amps, and dual PCI-e power connectors, I'd say you would be fine. Your's I guess is probably not. (but that's just my opinion). http://www.newegg.com/Product/Product.aspx?Item=N82E168...

That sucker consumes as much as 8800GT SLI. I'd probably buy one with 40+ amps if it were me.
June 27, 2008 3:12:29 PM

I just went through and looked at the detailed specs of the 4870 from every manufacturer and not one of them gave a amp rating for the card. In fact a couple actually had the specs for the 4850 under the 4870 like a 450w PSU with 1 6-pin PCI-E connector. As pauldh wrote you would be much better off with a new PSU, don't take a chance on not having enough power.
June 27, 2008 3:31:39 PM

Hmm that specific Cooler Master model does appear to be a bit on the shady side. That earthwatts EA500 for $50 looks like a sweet deal.

@ausch30: 160W / 12V = 13.3333333...3333333andsoonandsoforth Amps :) 
But you probably already knew this...were you looking for the 12V amp recommendation for the entire system? Because that will vary greatly depending on the system.
June 27, 2008 3:38:09 PM

oh god.. this is so confusing
June 27, 2008 3:45:57 PM

Quote:
Wow this is so simple you actually have to ask someone??

1)Go to ATI website, see what the 4870 requires in amps.
2)check to see if you psu has that much amps
3)If it doesnt, buy new power supply.



HAHAHAHA, you never fail to deliver.
June 27, 2008 3:47:27 PM

homerdog said:
Hmm that specific Cooler Master model does appear to be a bit on the shady side. That earthwatts EA500 for $50 looks like a sweet deal.

@ausch30: 160W / 12V = 13.3333333...3333333andsoonandsoforth Amps :) 
But you probably already knew this...were you looking for the 12V amp recommendation for the entire system? Because that will vary greatly depending on the system.


Usually they post a minimum total amp rating for the system using a particular card and yes I agree that it varies greatly depending on the system. You could be running a E2180 at stock or an overclocked QX9770 and a 4870 and the total amp ratings don't tell you how much you will actually need for the card but I was just surprised at the lack of information and the wrong information on the manufacturers sites. They spend so much time, effort and money trying to sell the card they forget to tell you what can actually run the card.
June 27, 2008 3:58:11 PM

u would probably be fine with ur current psu + n adapter bcoz 160W is da max draw.......but jus 2 b on the safe side i think u should get a new psu with 2 connector......u don wanna burn ur system coz it is risky using a adaptor. better to take precaution rather than risk toasting everything
June 27, 2008 4:03:09 PM

I have also been looking at the 4870. At one review site(don't remember where), they recommended 32a on the 12v rails.

On the side of your psu should be a spec diagram. Look for the amps on the 12v rails, and sum them up. If that is not there, see if you can deduce the total watts on the 12v rails, and divide by 12. Can you post a pic of the unit?

The cards will come with an adapter which should be ok, assuming that the psu is strong enough.

If in doubt, it's time to get a quality psu.
June 27, 2008 4:06:24 PM

ausch30 said:
Your PSU has 1 6-pin PCI-E connector and the 4870 requires 2, I would get a new PSU.



That is not exactly the case. What I think is that you need 2 6pin ONLY if your MB is PCI-E 1.0

If you have PCI-E 2.0 I think 1 6pin will do you ok

Here are the calculations behind these thoughts. 4870 stated power draw is 180W

PCI-E 1.0 = 75W + 6pin 75W + 6pin 75W = 225 W (enough) (only 1 6pin = 150 - not enough)
PCI-E 2.0 = 150 + 6pin 75W = 225W (enough)

I think even if you OC you wont get over 225W. But if you are extreme OC you better get PCI-E 2.0 MB as you would be able to feed that baby with 300W.

Just my 2 c
June 27, 2008 4:08:07 PM

i posted the link to the website in the 1st post.. it has all the details
June 27, 2008 4:14:13 PM

rawsteel said:
That is not exactly the case. What I think is that you need 2 6pin ONLY if your MB is PCI-E 1.0

If you have PCI-E 2.0 I think 1 6pin will do you ok

Might be, but I think it depends on how the architecture is designed. If the card is designed to draw power from the second connecter and it's not there, then you'll run into problems even if there's more power available from the PCI slot.
June 27, 2008 4:18:21 PM

geofelt said:
I have also been looking at the 4870. At one review site(don't remember where), they recommended 32a on the 12v rails.

On the side of your psu should be a spec diagram. Look for the amps on the 12v rails, and sum them up. If that is not there, see if you can deduce the total watts on the 12v rails, and divide by 12. Can you post a pic of the unit?

The cards will come with an adapter which should be ok, assuming that the psu is strong enough.

If in doubt, it's time to get a quality psu.

As pauldh mentioned, most of the time the maximum combined +12V output is considerably less than the sum of the individual +12V rails. That's because most PSUs don't really have multiple +12V rails, but one big one split up into a few smaller ones by OCP.

Edit: qwen, that PSU really looks like it might not cut it. I really recommend you invest in something along the lines of the Antec earthwatts EA500.
June 27, 2008 4:23:32 PM

OOPS! the link to the specs did not have the info, but I found it under the features tab. Go figure.

The psu is marginal. It will likely work, but over time a poor quality unit could deteriorate.
The unit is likely a tier 5(not recommended) unit on this list:
http://www.xtremesystems.org/forums/showthread.php?t=10...

You do not have any other unusual power hungry parts.
You could try it, and just keep a lookout for flaky performance.

For the investment you will be making in a fine vga card, I think it would be prudent to pick a tier3 or better unit from the list.
June 27, 2008 5:42:51 PM

no problem. It's a good price without rebates; I ordered a spare myself.
June 27, 2008 5:46:38 PM

thanks guys
thanks for all ur time and effort :) 
March 11, 2009 4:18:23 AM

Need Help! I'm in a similar position but with just 50 more watts. I'm pretty sure I will be ok, but wanted to see what everyone else here thought. I just bought a Sapphire 4870 and need to know if I have enough juice for it. Here are my specs:

MOBO : Asus p45 pro
CPU: 8200 Quad Core OC to 3.1 right now
Ram: 2x2 = 4 gig 1066Mhz
Video Card: on its way, ati 4870
Arctic Cooling for my processor
POWER SUPPLY: ATX 550 Watt Ultra X2

stats of PS:
+5V=30A =
+3.3V=25A =160W

+12V=17A =
+12V=18A =408W

-12V=.8A =
+5 VSB=2.5 A =22W =550 Watts

What do you think? Can I run a 4870? I hope so because it will be arrving sooN! If so, any room to OC? All help is appreciated.
March 11, 2009 4:00:39 PM

from the ati forums, ive read that some 4800s are getting messed up on a multi-12v rail PSU.

and for those who only have 1 pci-e cable from his PSU, a molex-to-pcie converter should be included in a 4870 bundle (i got one)
March 11, 2009 8:24:09 PM

ohhh, really? hmmmm, well thats not that good of news...
April 14, 2009 11:07:49 PM

I was wondering if my psu can handle a 4870 also. I will be upgrading from a 8600gts.

Cooler Master RS-550-ACLY
+12V1@18A,+12V2@20A,+12V3@10A, Peak

+12V1@12A,+12V2@12A,+12V3@6A, Continuity

Current System Spec's

Motherboard Chipset: nVIDIA nForce 650i Ultra
CPU Type: DualCore Intel Core 2 Duo E6850, 3000 MHz (9 x 333) Stock
System Memory: 2048 MB (DDR2-800 DDR2 SDRAM) g.skill @1.85v
Video Adapter: NVIDIA GeForce 8600 GTS (256 MB)
Disk Drive : Seagate (320 GB, 7200 RPM, SATA-II) x2
Disk Drive : Seagate (500 GB, 7200 RPM, SATA-II)
April 15, 2009 3:42:18 AM

Bump
April 15, 2009 4:33:25 AM

Nonpoint said:
Bump

A 4870 requires two pci-e connectors,
The simple rule is: If the psu has two pci-e connectors, it should have enough power to give them each the 75 watts that the spec requires.
If you need a pci-e adapter, or if the quality of the psu is suspect then be cautious.
April 15, 2009 8:12:32 AM

I think "CoolerMaster Silent Pro 600" would be best for you..
April 15, 2009 10:54:39 PM

Im sorry, what I was stating is the psu in my last post is my current psu, and I was wondering if it was up to the job of handling a 4870 with my system spec. :)  Sorry for the misunderstanding.

Quote:
A 4870 requires two pci-e connectors,
The simple rule is: If the psu has two pci-e connectors, it should have enough power to give them each the 75 watts that the spec requires.
If you need a pci-e adapter, or if the quality of the psu is suspect then be cautious.


I wasn't worried about the wattage, but more so the amps of the 12v rails.
April 30, 2009 4:03:30 PM

Quote:
A 4870 requires two pci-e connectors,
The simple rule is: If the psu has two pci-e connectors, it should have enough power to give them each the 75 watts that the spec requires.


hey all, I have a related question...

Just bought a Corsair 750TX (750W) PSU

Trying to connect to two HD 4870's in Crossfire

As stated above the cards each have (two) 6 pin PCI-E connectors, my PSU has (four) PCI-E 6+2 cables.

What the heck is the "+2" for? Can I safely connect the four PCI-E 6 pin cables and leave all the +2's hanging?
April 30, 2009 7:05:47 PM

Some cards use 8 pin connectors so that's what the other 2 pins are for. Yes it would be fine to just leave the 2 extra pins hanging there.

April 30, 2009 7:08:15 PM

fearofblackhat said:
Quote:
A 4870 requires two pci-e connectors,
The simple rule is: If the psu has two pci-e connectors, it should have enough power to give them each the 75 watts that the spec requires.


hey all, I have a related question...

Just bought a Corsair 750TX (750W) PSU

Trying to connect to two HD 4870's in Crossfire

As stated above the cards each have (two) 6 pin PCI-E connectors, my PSU has (four) PCI-E 6+2 cables.

What the heck is the "+2" for? Can I safely connect the four PCI-E 6 pin cables and leave all the +2's hanging?


Not to worry. The +2 is an extra 2 pins to accomodate vga cards that require 8pin connectors. Just leave the two pins disconnected of you only need 6.
July 17, 2009 2:09:42 PM

I bought a HD 4870 512mb graphics card 2 days ago and when I plug it in my computer and turn it on it starts up for half a second and then shuts off! I cant get it to work.

My PSU is a 650w Win power ATX-650, I know it isnt a good PSU but it is 650w and has enough amps:

Output:
+12V1 23A Max
+12V2 23A Max
+5V 40A Max

+3.3V 30A Max
-12V 0.8A Max
+5V/SB 3.0A Max

if anyone can solve my problem or help me I will be very happy as I cannot run my brand new graphics card :( 

here is my post on your forum: http://www.tomshardware.co.uk/forum/page-267400_15_0.ht...

I thought I would ask here as it must be related to my PSU as it is a low quality one?
July 18, 2009 4:51:11 PM

My PSU is low quality and not delivering enough power.

I am going to buy an Antec earthwatts EA500 PSU which should power the HD 4870 graphics card np. :bounce: 
October 24, 2009 1:21:12 PM

cm extreme power plus 650w got x4 6pin cable for the ati hd4870 cf ?
!