give perfect answers

November 25, 2009 at 05:27:30
Specs: Windows XP
i have p4 dell optiplex gx270 with agp slot it has ddr ram memory 1gb 400mhz will it support ddr2 or ddr3 graphics card specailly 1gb or 512mb ati hd 4670 will it run.

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November 25, 2009 at 06:02:41
As it was explained when you were blackhawkdown, video memory types and amounts have nothing to do with system memory. If it's AGP bus, you can use it. Your main concern, once again, is the Power Supply. You have a Dell Optiplex gx270 and I'll bet it doesn't have more than a 350 watt power supply and probably a crappy one at that. Since the newer AGP cards need additional power to run smoothly, you need to make sure you have an ample 12 volt rail on your power supply.A lot of the newer AGP cards, like the one you're looking at, require a minimum of 400 watt PSU with 30 amps (most important) on the 12 volt rail. Open the case and write down the specs of your PSU and post back. If you don't do this, we're at a dead end.

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November 25, 2009 at 06:27:02
There is no need to upgrade vga card u have hd 3850 right? As i said earlier i u want to enjoy modern games u need at least dual core system

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November 25, 2009 at 06:33:56
30 amps ?
its using so much power,grasshoper?

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November 25, 2009 at 06:46:07
To jump in here I would state that the most powerful graphics cards can draw 16/17 Amps by them selves. That leaves the remainder to run everything else that requires 12V. CPU, drives, fans, etc.

Upgrading that older Dell is not cost effective. Buy or build a new computer that is capable of doing what you need it to do.

Keep the working Dell as a second backup unit or sell it for a few bucks.

I might add that demanding perfect answers is pretty arrogant. This is a free public forum.

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November 25, 2009 at 06:47:53
No, it doesn't use that much power. It's shared with the other components. I'm talking about a PSU with only 1 12 volt rail. That's what the specs are on some of the new agp cards especially the 3850.

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November 25, 2009 at 06:51:52
I agree with OtheHill. Unless you have no other choice, don't dump any more money into that machine. And I'm still laughing about the "perfect answers". Reading is the first part, comprehending the answer is the key.

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November 25, 2009 at 07:49:09
That's right! You've been told by more than one person here that video card memory has absolutely nothing to do with system memory.

The HD3850 AGP is the best agp video card money can buy; your next upgrade is a new system.


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November 25, 2009 at 11:03:43
"The HD3850 AGP is the best agp video card money can buy"

Believe it or not, ATI is still upping the ante for AGP cards. There's now AGP versions of both the HD 4650 & HD 4670. I believe the HD 4670 is slightly better than the HD 3850. It's probably not worth paying $100 for an AGP card, but they're available to those who want to cling to their old AGP system a while longer.

Here's an HD 4670 1GB GDDR3 for $100 after rebate with free shipping:

Here's an HD 3850 512MB GDDR3 for $89 + shipping:

And xtreme i7 aka black_hawk_down_2010 aka black hawk, stop changing your screenname & asking the same questions. You have been given the "perfect answers" several times by several different people...what do you not understand?

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November 25, 2009 at 13:13:53

400 watt power supply only uses 3.3 to 3.6 amps for the ENTIRE system [given volts is 110 or 120 depending on who you talk to]


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November 25, 2009 at 13:18:29
Yeah, on the AC side. For video cards, we're talkin +12v DC power and a psu with 30a on the +12v rail (single rail psu's) is 'bout bare minimum for a system with a mid range video card.


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November 25, 2009 at 13:37:39
I was commenting on the 30amps and 16/17 amps video card power consumption. Perhaps they confused amps with volts.

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November 25, 2009 at 14:02:04

Perhaps you are the one confused. Look at the link below for wattage for contemporary graphics cards.

Wattage divided by voltage = Amperes

Most if not all the wattage consumed is off the 12V rail. Do the math. The most power hungry card in that chart consumes over 20A @12V.,...

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November 25, 2009 at 14:59:03
You don't usually convert to amps when talking about video cards. You talk in watts.

"System Requirements

–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)”

from here

Your math is correct but grabbed my eye when the OP posts a 400watt power supply [= to 3 amps] and you are saying the video card alone uses 16 amps which is 5x the power supply supply.

Even your link is in watts not amps.

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November 25, 2009 at 15:57:23
(80PLUS, RoHS Compliant)
400 Watts ATX+12V Switching Power Supply
Input Current: Max 6A (RMS) @ 115Vac, 3A (RMS) @ 230Vac

Take note on how the Input Amperage is halved as the Voltage is doubled.

The opposite happens when you step the voltage down. If all the current was converted to 12V in this instance the total Amperage would be 30A.

Look at the recommendations for amps on the 12V rail mentioned above. 30A.

It is also necessary to take into consideration that the average PSU is 80% efficient and the manufacturers fudge the available Amps on each rail.

Take my word for it, some cards can consume up to 20A @ 12V.

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November 25, 2009 at 16:23:58
"You don't usually convert to amps when talking about video cards. You talk in watts"

That's fine, but you need a basic understanding of where that wattage is coming from. A PCIe x16 slot is capable of supplying up to 75W. Of that, 5.5A comes for the +12v, the remainder from the +3.3v. If you look at a 6-pin PCIe power plug, it has only yellow & black wires. Black, of course, is ground, yellow is +12v. And since this plug is also capable of supplying up to 75W, do the math: 75W/12v = 6.25A.

So if you have a PCIe x16 card that requires the 6-pin aux power plug, it can potentially draw up to 11.75A (5.5A + 6.25A) from the +12v rail, or 141W.

An 8-pin PCIe plug is capable of supplying up to 150W, all of which comes from the +12v rail. So 150W/12v = 12.5A, plus the 5.5A for the slot = 18A. Whether or not the card requires that much depends on the card, but when choosing a power supply, you need to take into account the potential of 18A of +12v being needed by the video card alone.

Modern CPUs are powered entirely by the +12v. Like the video card, the power requirement varies depending on the CPU. On the higher end, there are CPUs that require 140W, so once again, 140W/12v = 11.67A.

So with a high end video card & a high end CPU, you would need at least 23.42A (11.75A + 11.67A) on the +12v. But that doesn't take into account HDDs, optical drives, fans, etc. If you figure 2A per drive & 0.25A per fan, that would add at least another 5A to the total. Now we're sitting at 28.42A. So when Skip says 30A on the +12v is about the bare minimum, he's right in the ballpark.

30A x 12v = 360W, and when you add on the +3.3v & +5v rails, you should see why 400W should be the minimum size PSU used these days.

Now I realize that these numbers assume max load, but even so, do you think it's wise to potentially load 28.43A on a +12v rail with a max of 30A? That's cutting it pretty close. It's always smarter to get a PSU with higher wattage than is generally required...that way you have a bit of a safety buffer. But when choosing a PSU, you can't go by wattage alone. You also have to pay close attention to the amperage rating on the +12v to make sure you azz is covered.

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November 25, 2009 at 17:38:26
And OtH said...

"Take my word for it, some cards can consume up to 20A @ 12V."

Yep, and that's a card with a single gpu. A card like the 4870 X2 with 2 gpu's ups the ante to ~36A of that +12V power. It gets better too. Someone who wants extremely high power video cards (or 2 or 3 of 'em) are also running systems that gulp another 400+w of 12v power. These guys have found that even a quality 1000w psu ain't enough and these monsters ship with a half dozen of 8pin 150w plugs jam spoke of in #15.

Extreme example? Sure; but I know of a couple in my neighborhood. One provided me with a nearly new Corsair 950TX for 75 bucks at a yard sale. That's a lot of psu with 78a on a single 12v rail. Still, only 25a on the +5v rail and 25a on the +3.3v rails...about the same amount you'll see on a psu of much less power.

At least my azz is covered. Maybe I can add a disc changer, cb radio and cigarette lighter to my next build.:)


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