card+psu=?

[dasos]

I m thinking to buy this card-->
SAPPHIRE RADEON HD7750 ULTIMATE 1GB DDR5
replacing a 3 years old 9800gt green.

The specs say that 7750 requires minimum a psu of 450W.
But 7750 has a TDP of just 55W…
My psu is 430W (Corsair CX).
9800gt green has a TDP of 75W. So, do I already have an insufficient psu? The rest of my system is a cpu TDP 95W, 2 dimms of DD3, a soundcard, a dvd-rw, an ssd and 3 fans.

 

[Okedokey]

The 9800GT will draw more power (100W TDP actually) than the 7750 (around 60W) and the CX430 is fine for both as it has 28A on the 12V rail. Plenty.

Don't expect massive improvements though, the 7750 isn't that great. You will get around 30% improvement across the board and DX11. Thats about it.

You can keep the 9800GT and use it for Physx if your motherboard and games support it. Your PSU will handle both cards.

 

[dasos]

Its not 9800gt, its 9800gt green, which draw only 75W(no extra power connector).

Suppose that 7750 is a serious upgrade, because 9800 green's WEI is 6.8
while I heard that 7750's WEI is 7.4

I pick this model because has a passive heatsink.
So u r sure that psu is enough, althought specs say that requires 450W.

 

[Okedokey]

PSU is fine. The recommendations are made on wattage based on the fact that people buy cheap designed rubbish. Some have as little as 12A on the 12V rail. Yours has 28A plenty.

Either way what i said above holds true - the 7750 will draw less power.

Oh and btw, don't believe WEI, its meaningless and rubbish.

Also, if you're getting a passive 7750, really don't expect anything much better. If you're playing games it probably wont be worth it. If you're looking for some other use, then specify your budget and the boys will help.

Just to clarify for you, the CX430 will handle a much better gpu, like the GTX760 and still have 170W left over so don't stress.

 

[dasos]

.

You can keep the 9800GT and use it for Physx if your motherboard and games support it. Your PSU will handle both cards.

Can I have both 9800GT green and 7750 in the same pc??

And a 430W psu will hold them?

 

[Okedokey]

Download PC Wizard from my sig and install it. Go to FILE, SAVE as and click OK. Copy the text out of that file into this thread.

 

[dasos]

What for?

Oh and btw, don't believe WEI, its meaningless and rubbish.

Also, if you're getting a passive 7750, really don't expect anything much better. If you're playing games it probably wont be worth it. If you're looking for some other use, then specify your budget and the boys will help.

Yes I know that WEI is not trusting, but usually when gives a better score to device A than device B, means that device A is better.

So, u dont believe that 7750 is better than 9800gt green(9800gt green is weaker than normal 9800gt)...

You say that a fanless 7750 is weaker than a normal/fanfull 7750? Why??

 

[Okedokey]

Alright mate, some trust is required. The wizard allows me to understand if your motherboard can handle the extra card.

A passively cooled card will almost certainly have lower clock speeds and voltages to account for the cooling requirement. This = slower.

Yes, the 7750 will be much better, but not a huge amount. Depending on your budget (max) and use, you could probably do better.

And no, WEI is crap. Its crap plain and simple.

Do the following if you want help:

1. PC wizard install and report
2. Post budget and use case (what games etc)

 

[dasos]

I know if my mobo can handle 2nd card, I m not amateur. The question was for the psu.

Check the link and tell me if this passive model has lower clocks than the normal model.

I can do any measuring u want, but plz answer to my exact questions(and dont make edits in previous posts).

 

[Okedokey]

Dude the PSU is fine. ive said it 3 times.

And yes, the core clock is 100MHz slower than reference.

 

[dasos]

Meanwhile they have been more questions.
Its not necessary to answer something 3 times, but answer something else 0 times...

So, the only difference between this passive model and the normal model is -100MHz clock?

You will get around 30% improvement across the board

+30% compare to 9800gt or compare to 9800gt green?
(I m not sure if u have understood that they r 2 different models)

Dude the PSU is fine

U r talking for single or both cards together?

 

[Okedokey]

Ok mate this is the answer to your question.

Both graphics cards on today's standards are rubbish.

Your PSU will handle much better than a sub 100W TDP card (read double).

Almost always - passive designed cards are not designed for gaming, but home theatre where noise restrictions are important. Thus your card having 100MHz less core, and half the reference VRAM. If you're a gamer, you might be better of getting another 9800gt and putting in SLI.

If you're gaming, you might, repeat might, see extra frames, but that will depend on the rest of your rig, games played and your gaming resolution. But since you wont tell us, thats hard to determine. But yes it will be an improvement. Worth the money? May be.

Again, the PSU is fine.

Anything else?

 

[dasos]

U keep on writing info which I didnt ask for...

I didnt ask if these cards are rubbish for your taste. Can u plz try focus to my points?

If u avoid answer, u force me repeat-->
Is "psu fine" for both cards together?

I want to examine the differences of this passive model with the normal one.
I also want to examine the exact differences between this silent 7750 card, and 9800gt green card.

Dont insist to gaming, it is not my goal. Silence, cooling, low voltage are more important to me.
Its a good idea first to know what someone wants, then give him offtopic advices

Whats "half the reference VRAM"?

 

[Aastii]

Your power supply will handle 1 card, not both.

If you are not gaming, why do you need a new card? It will make no difference to every day use and it will most likely be worse in any CAD tasks/GPU simulations due to a lack of CUDA cores on the AMD card.

Half VRAM is half of the video memory available to the GPU. generally speaking, less memory will mean you will not be able to handle such detailed textures ir such high resolutions when doing GPU intensive tasks.

The difference is less performance than a reference card and awful cooling. You are better off with an active heatsink than passive, as the sound difference is negligible, yet you get more performance and better cooling

 

[dasos]

If you are not gaming, why do you need a new card? It will make no difference to every day use and it will most likely be worse in any CAD tasks/GPU simulations due to a lack of CUDA cores on the AMD card.

There is difference.
7750 draws 55W while 9800gt green draws 75W.
This also means that 7750 will be cooler.
7750 can give more fps in games than 9800gt green(I m gaming but not much)

There is also another one reason, I suspect 9800 reached to its end, but lets dont discuss it now).

Can u explain me this phrase "it will most likely be worse in any CAD tasks/GPU simulations due to a lack of CUDA cores on the AMD card"

Half VRAM is half of the video memory available to the GPU. generally speaking, less memory will mean you will not be able to handle such detailed textures ir such high resolutions when doing GPU intensive tasks.

Both cards have memory 1GB.
But 9800 has DDR3(which I heard is lame) and 7750 DDR5.

The difference is less performance than a reference card and awful cooling. You are better off with an active heatsink than passive, as the sound difference is negligible, yet you get more performance and better cooling

Explain me, why there is less performance? Less performance compare to the active 7750?
Because of -100Mhz clock as Okedokey said?

Awful cooling? I think u r not experienced in passive cooling. All of my cards and cpus are passive in the last years. 9800gt green wears an arctic cooling accelero heatsink, which look like the one of that 7750. And what temp u think I have? 200oC?
The sound difference is like this--> I hear nothing from the whole pc

 

[Okedokey]

Mate it sounds like you know everything you need to know, go for it.

 

[dasos]

I read this

The 80 Plus Bronze rating means that the PSU is rated for at least 82% efficiency at 20% load, 85% at 50% load, and 82% at 100% load.

This means that 430W are real 352?

 

[SpringWater]

I read this

The 80 Plus Bronze rating means that the PSU is rated for at least 82% efficiency at 20% load, 85% at 50% load, and 82% at 100% load.

This means that 430W are real 352?

Pretty much, but as far as I know it can actually be more, but the manufacturer can only guarantee you 352 watts.

 

[Okedokey]

I read this

The 80 Plus Bronze rating means that the PSU is rated for at least 82% efficiency at 20% load, 85% at 50% load, and 82% at 100% load.

This means that 430W are real 352?

No, that is an amature mistake. I see this all the time.

Pretty much, but as far as I know it can actually be more, but the manufacturer can only guarantee you 352 watts.

And this is just plain wrong.

80% efficiency simply means to provide the full 28A on the 12V rail (or the full 430W across all rails), it will draw 20% more power from the wall.

Therefore in your case, the CX430 can deliver quite happily the full 28A on the 12V rail which is 336W. But in order to do so it will require around 403W from the wall. Or in the unlikely scenario where all voltage divisions are maxed to the 430W (continuous), it will draw 516W from the wall to deliver the 430W DC.

That is all, the PSU can still deliver what it is rated at.

And 28A is LOADS for what either or both of those cards require.

 

[StrangleHold]

I read this

The 80 Plus Bronze rating means that the PSU is rated for at least 82% efficiency at 20% load, 85% at 50% load, and 82% at 100% load.

This means that 430W are real 352?

Efficiency has nothing to do with the amount of watts on the rail. Its the amount of power pulled from the wall vs. to produce the wattage on the rail.

Look at it like a cars gas mileage. You have two cars with 450 HP but one gets 15 MPG and the other gets 20 MPG. The 20 MPG is more efficient. They both have 450 HP. Same with power supplies.