question relating the requirement for a 1950pro

[sharTwise]

before buying a new 1950pro card i did some research.
so i've searched here in forums quite a bit. found out that its recommended to have 28amps on +12V rail.
but then i also read that people with 22-25amps run it smooth without any problem.

so far so good..
then i open my pc-case to have a look on my PSU. it says:

~~~~~~~~~~~~~~~
EN-4000 (ENlight)

Model: GPS-350CB-102A

Frequency: 50-60Hz
Peak: 400W
Rated: 350W

DC Output:
+12V1--- 10A---120W
+12V2---15A---180W

~~~~~~~~~~~~~~~

now to my questions:
- whats with this 12V1 and 12V2 things? should they be added or something?
- how many amps do i have on +12V rail overall?
- will it be enough to run a powercolor 1950pro, which has a requirement of 66W?

thanks for help

 

[sharTwise]

20 views 0 replys... good night

 

[spuddyt]

its because most people (like me) aren't confident on how to work out PSU stats, if you wait long enough, people will post (48 hours is as long as I would be willing to wait)

 

[Ilander]

Okay...as a physicist (well, an in-school one), current in equals current out. If 10 amps flows in from one source, and 15 amps flows in from another, they will combine for a total of 25. The problem, though, is that they don't necessarily combine linearly in the graphics card itself. Now, since they almost assuredly DON'T, and your Power Supply isn't perfect, you're going to want to go over the real required power. That's why ATI recommends 28 amps.

I would be nervous about using this PSU on a X1950XT or XTX, but PROs should run fine.

Also, I've pimped it before, I'll pimp it again. The HD 2600XT ddr 4 version outperforms the X1950GT with latest drivers...it's right at the level of the X1950PRO. It ALSO doesn't require an external power connect, and shouldn't be ANY problem for your PSU.

 

[kpo6969]

before buying a new 1950pro card i did some research.
so i've searched here in forums quite a bit. found out that its recommended to have 28amps on +12V rail.
but then i also read that people with 22-25amps run it smooth without any problem.

so far so good..
then i open my pc-case to have a look on my PSU. it says:

~~~~~~~~~~~~~~~
EN-4000 (ENlight)

Model: GPS-350CB-102A

Frequency: 50-60Hz
Peak: 400W
Rated: 350W

DC Output:
+12V1--- 10A---120W
+12V2---15A---180W

~~~~~~~~~~~~~~~

now to my questions:
- whats with this 12V1 and 12V2 things? should they be added or something?
- how many amps do i have on +12V rail overall?
- will it be enough to run a powercolor 1950pro, which has a requirement of 66W?

thanks for help

I wouldn't think so.
To figure amps:
(you have to look on the label of the psu)
Maximum wattage amount on the combined 12v rails
divided by 12 = amps
You do not just add 12Va + 12Vb
example (my old psu) Dell 305w = 22amps
18a + 18a = 264w maximum wattage on the 12v
264 divided by 12 = 22amps (that's your 12v amperage figure you need)

 

[honestjohn_]

before buying a new 1950pro card i did some research.
so i've searched here in forums quite a bit. found out that its recommended to have 28amps on +12V rail.
but then i also read that people with 22-25amps run it smooth without any problem.

Exactly what Kpo6969 said. You appear to have only around 17.5a of sustained/continuous power on your combined +12v rails.

See link to your Power Supply below.

http://us.enlightcorp.com/Product/Product_Detail.aspx?ID=47

It works out this way .....

(+5V, +3.3V, +12V1 & +12V2) = 340W

Subtract

(+5V & +3.3V)= 130W

= (+12V1 & +12V2) = 210w

Then 210w divided by 12 = 17.5a on combined +12v rails

Manufacturer's recommended specs call for 30a of sustained/continuous power on the +12v rail or rails for multi-rail units / not peak power. You may get by with a little less, but it's highly system dependent and if you use that power supply, you'll really be pushing your luck. Here's a link to one of the best low cost power supplies I'm aware of. Good luck.

http://www.newegg.com/Product/Product.aspx?Item=N82E16817139003&Tpk=corsair%2b450vx

 

[Ilander]

30 amps sustained, eh? Yep, what they said, I fully agree. Peak Watts (and amps) are momentary spikes...if your card needs that for a millisecond, your PSU can handle it...after that, the power dissipation is too much.

Try a better PSU, or, barring that, a card with lesser power requirements.

 

[mactronix]

Ilander
What you said about the X2600XT being as near as a 1950 pro or equal to a gt. i like the card but have been put off by lack of performance do you have any links to help sway me ?
Mactronix

 

[blade85]

The HD 2600XT ddr 4 version outperforms the X1950GT with latest drivers...it's right at the level of the X1950PRO. It ALSO doesn't require an external power connect, and shouldn't be ANY problem for your PSU.

Meh, at lower res and no AA or AF it contends well. But as soon as you go higher in resolution and start adding AA it drops like a dead fly. Also the power consumption difference between the two is about 10-20 watts tops.

http://www.bit-tech.net/hardware/2007/08/14/radeon_hd_2600_xt_vs_geforce_8600_gt/1


This was posted mid august, so yes the drivers are older ones, but i cant seem to find any new ones. Feel free to post some of your own benchmarks so we can compare then to the old one.

 

[mactronix]

Well i just looked it up and gotta say im not impressed
http://www.tweaktown.com/articles/1184/1/page_1_introduction/index.html
I think its indepth enough to be taken at face value so no gains after all then.
Mactronix
I mean so the hit for AA isnt as big but i would need to see across the board fps inprovement before i was tempted to buy one.

 

[honestjohn_]

Meh, at lower res and no AA or AF it contends well. But as soon as you go higher in resolution and start adding AA it drops like a dead fly. Also the power consumption difference between the two is about 10-20 watts tops.

http://www.bit-tech.net/hardware/2007/08/14/radeon_hd_2600_xt_vs_geforce_8600_gt/1


This was posted mid august, so yes the drivers are older ones, but i cant seem to find any new ones. Feel free to post some of your own benchmarks so we can compare then to the old one.

I agree, I found another site which also looked like they did some pretty thorough testing and they reached the same conclusions with the same results.

 

[prodystopian]

Did you alread buy the card? If not, you should consider the 2600xt. The new drivers make it a respectable card. Or if you can afford it, get a better power supply first and then pick up the 1950pro. I wouldn't recommend running it on your current PSU.