i have a graphics card problem

March 1, 2011 at 19:57:06
Specs: Windows vista, 2gb
Im trying to install a radeon hd 2900 xt graphics card on my emachines t5082 but whe i turn on the computer the card displays nothing even though it sounds like its running.

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#1
March 1, 2011 at 20:23:25
If you're still using the power supply that came with the computer, you need to upgrade. The 2900XTs were hot, power hungry video cards. That Bestec power supply won't cut it.

A 400-450w PSU from Corsair, Antec, Enermax, or PC Power & Cooling would easily handle that card.

Super PIII | Unlocked ES Tualatin @ 1.8GHz (150x12, 1.65v, 512K L2)
2GB PC2700 | 500GB | Radeon x1950Pro | Apollo Pro 266T | Win 7 Pro


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#2
March 1, 2011 at 20:34:05
Radeon HD 2900 XT

System Requirements
* Connection to 550 Watt (750 for CrossFire™) or greater power supply with two 2x3-pin PCIe® power connectors is required.
* For enhanced performance with ATI Overdrive™, a power supply with one 2x3-pin and one 2x4-pin PCIe® power connector is required

750 for CrossFire™ - as in, for two HD 2900 XT video chipsets

Your power supply must have at least the minimum capacity required to support a system with the graphics card you are using installed, or the max graphics card you might install in the future.
(Onboard video - video built into the mboard - IS NOT A CARD ! )
If that info is not in the ad for the video card, you can go to the video card maker's web site and look up the specs for the model - often under system requirements - the minimum PS wattage, and, more important, the minimum amperage the PS must supply at 12v is stated. If you don't find that, any card with the same video chipset including any letters after the model number has very similar minimum PS requirements. Some power supplies have two or more +12v ratings - in that case, add those ratings to determine the total +12v current capacity.

In this case, that's 550 watts.

If you're a gamer...
In most if not all cases, the max capacity rating of the PS is an intermittent rating. It's recommended that you do not load your PS to any more that 80% of that rating if you are going to be using something that puts a constant load on it, such as playing a recent game for hours on end. In that case, you multiply the min capacity stated for the system with the particular video chipset on the card by 1.25 to find the min. capacity of the PS you should get.

In this case, 550 x 1.25 = 687.5 watts minimum.

If you need to get a PS with more capacity, you can usually replace it with any decent quality standard sized standard ATX PS.

Standard (PS/2) power supply size - 86mm high, 150mm wide, 140mm deep, or 3 3/8" h x 5 7/8" w x 5 1/2" d , or very close to that, though the depth can be more or less for some PSs.

Don't buy an el-cheapo (in quality) PS.
See response 3 in this:
http://www.computing.net/answers/ha...
................

"The 2900XTs were hot, power hungry video cards."

That's true, but that was an excellent video chipset for it's time.

Using the info here......

Comparison of ATI graphics processing units
http://en.wikipedia.org/wiki/Compar...

......I made a chart in Nov 2008.

The HD 2900 XT with 1gb (1024mb) of video ram was tied for # 1 in bandwidth.
The HD 2900 XT with 512mb of video ram was tied for # 3 in bandwidth.

The Radeon HD 2900 XT runs at different clock frequencies in each of its two operating modes, 2D and 3D, while for Radeon HD 3000 series, as implemented the ATI PowerPlay technology, the clock frequencies may vary in different usage scenarios......

core clock / memory clk /bandwidth /video ram /core config (# unified shaders)/ my bandwidth rating
2400XT 700mhz 800mhz 12.8gb/sec 40 * 15
2600pro 600 700 22.4 120 * 12
2600XT 800 900 35.2 120 * 9
2900GT 600 800 51.2 240 * 8
2900pro 600 800 105.6 512mb 320 * 3 (tie)
2900pro 600 1000 128 1024mb 320 * best (tie)
2900XT 743 825 105.6 512mb 320 * 3 (tie) see note above
2900XT 743 1000 128 1024mb 320 * best (tie) see note above
3470 800 950 15.2 40 * 14 (tie)
3650 725 800 25.6 120 * 11 (tie)
3690/ 666 828 25.6 320 * 11 (tie)
3850 666 828 53 320 * 7
3870 775 900 57.6 320 * 6
3870XT 775 1125 72 320 * 4
4470 800 800 15.2 * 14 (tie)
4650 600 667 21.3 667 * 13
4670 750 1000 32 1000 * 10
4850 625 883 63.5 993 * 5
4870 750 900 115.2 900 * 2
........

Others I didn't have in the chart...

1900xT 625 725 46.4
1900XTX 650 775 49.6
1950GT 500 600 38.4
1950Pro 575 690 44.2
1950XT 625 900 57.6 256mb
1950XT 625 800 51.2 512mb
1950XTX 650 1000 64.0


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