Fx 5900 Xt

[Kazzir]

I have a couple of newbie questions about my 5900XT... It's normal speed is 390/700. I can get to the overclocking settings in two different windows. When I open the display/settings/advanced/gf5900 window and hit clockspeeds it has two buttons at the bottom, one is "Test Changes", the other is "Detect Optimal Frequencies". When I hit 'detect optimal' it usually comes out with around 410/730... Not much of an increase. If I set them manually it makes me "test changes" and wont accept my numbers usually.

Can someone fill me in:
1) do I need to use this screen & 'test changes' method to o/c?
2) i know its a cheaper model, but is 410/730 really the best I can expect?
3) if I set it manually does the core/ram speed need to be at a certain ratio?
4) What is D.O.T. (Dynamic Over-Clocking Technology) and what should it be set at (1-6)?

Any info is appreciated, thanks in advance.

[Ace]

I have the same card. I overclocked it with RIVATUNER to 465/940. But it is faster at 450/850. I don' know why but i have bettr score in 3D Mark with lower frequency. What's your score in 3D Mark2003?

[Doomgeneration]

just go up at 5 hz jumps and push test...if it doesnt tell you it failed then hit apply changes and then go up five more hit apply. until it fails. by fails i mean a text box will come up and tell you the test wont run. then go up in 1 hz jumps and repeat...after you cant go up anymore, if you dont have any instability then run a benchmark program. if its unstable. downclock it.

[football]

I have the same card. I overclocked it with RIVATUNER to 465/940. But it is faster at 450/850. I don' know why but i have bettr score in 3D Mark with lower frequency.


Your card should be faster at 850 than 940, since the theoretical speed of 2.8 ram is 714. Now that's if you have 2.8 memory, some XT's have 2.5. That would put the theoretical speed of the ram at 800, meaning it should have more overclocking room. My XT, which it's not in design has 2.2. That means my theoretical speed is a bit more at 908, thus giving me more overclocking room. These ns values on ram seperates it, from the 5950U because it is rated at 2.0ns (1000mhz).The typical XT is clocked at 400/700, meaning it is shipped right at it's theorectical point at how fast the ram should be. So any overclock past that point, is a bonus. It is very unlikely that 2.8ns ram, will run at 940. This is the reason why a XT is not used for mod, into a 5950U. Can it be made to read as one? Yes, but you will have to lower the default speeds to do so.

Here is how you determine the theoretical value of your ram.

1000 will be devided by whatever ns's your ram is, then read as DDR.

1000^2.8=357
357=DDR 714

1000^2.5=400
400=DDR 800

1000^2.2=454
454=DDR 908

1000^2.0=500
500=DDR 1000

Theoretical is what the memory should beable to run at with no problems, anything higher is a luck of the draw. Overclocking the ram more than it's capable of handling, will result in worst performance.

[Ace]

How can i find out what memory my VGA uses?

[football]

How can i find out what memory my VGA uses?

Look at the numbers on your VGA ram chips, and post what ya got?

BTW...Which card do you have?

[Kazzir]

Thanks for the responses.

So does anyone know what this D.O.T. feature is? It has options to set it to 1-6 and it looks like (1)Novice (2)Private (3) Sargent....etc..up to (6)General

???

[Ace]

On my VGA RAMS are these lines:

hynix KOR
HY5OU283222A
F-28 419A
W7CD7023KQ


I have Leadtek Winfast A350XT-TDH

[Ace]

D.O.T. means dynamic overclocking technology which automatically(when you play a game or run a test) overclocks VGA to set frequency 1 is low O/C For 6 you usually need better cooler than is standard.

[Quailane]

Your card should be faster at 850 than 940, since the theoretical speed of 2.8 ram is 714. Now that's if you have 2.8 memory, some XT's have 2.5. That would put the theoretical speed of the ram at 800, meaning it should have more overclocking room. My XT, which it's not in design has 2.2. That means my theoretical speed is a bit more at 908, thus giving me more overclocking room. These ns values on ram seperates it, from the 5950U because it is rated at 2.0ns (1000mhz).The typical XT is clocked at 400/700, meaning it is shipped right at it's theorectical point at how fast the ram should be. So any overclock past that point, is a bonus. It is very unlikely that 2.8ns ram, will run at 940. This is the reason why a XT is not used for mod, into a 5950U. Can it be made to read as one? Yes, but you will have to lower the default speeds to do so.

Here is how you determine the theoretical value of your ram.

1000 will be devided by whatever ns's your ram is, then read as DDR.

1000^2.8=357
357=DDR 714

1000^2.5=400
400=DDR 800

1000^2.2=454
454=DDR 908

1000^2.0=500
500=DDR 1000

Theoretical is what the memory should beable to run at with no problems, anything higher is a luck of the draw. Overclocking the ram more than it's capable of handling, will result in worst performance.

Well, just for the other side of the story, my 5900xt is flashed to a 5950 ultra completely. I can do 512Mhz core and 1.02Ghz memory in 3d.

[football]

Well, just for the other side of the story, my 5900xt is flashed to a 5950 ultra completely. I can do 512Mhz core and 1.02Ghz memory in 3d.


Just for the record, you are one of the few.

The 5900xt is not the ideal card to mod to a 5950U, you just never know what memory will be on that card.

With a 5900nu, you will get 2.2 ram, no need to guess. With that said, it's not even a gaurantee to run at 5950U speed. We won't even talk about using tighter latency with 2.8 ram running at 475/975 for higher performance, that's just out of the question.

I would not run 2.8ns memory over 850 max, why burn up a good card?

Ace, your ram is 2.8

This is the number that will tell you that "F-28 419A", the F-28.

Knowing that, you should not run your memory higher than 850 max. Actually, 800 is a good number. Remember, 800 is already 100mhz over it's rated speed.

Ace

You can also flash your card to a 5950U bios, with lesser speeds. Then maybe you might get higher on the memory, since you will have higher volts and looser timings. Or just be happy with that what you have, and enjoy!

[Ace]

Now i beat with additional cooling 500\950. 3D mark03 sometimes freeze for max.10 seconds. Will it be better if i flash it to 5950U. It has higher voltage for core, i think.

[sevendevilhell]

depends what brand the card is. if it's leadtek or gainward, don't worry about the coolbits registry hack. just use their software to overclock.

mine is running perfectly at 460/850. it's a leadtek FX 5900XT. i'm going to push the clocks up to 475/950 and then flash to the 5950 ultra BIOS (5950 BIOS adds some voltage to the core and memory so those higher clocks will be stabilized a bit. it will also warm the chips up a bit).

[Rich Avery]

I have the same card. I overclocked it with RIVATUNER to 465/940. But it is faster at 450/850. I don' know why but i have bettr score in 3D Mark with lower frequency. What's your score in 3D Mark2003?

That is because of throttling, I have completely disabled throttling because my card runs cool enough at 450/900. I did it by editing a 5950 bios...

[chalky]

Just for the record, you are one of the few.

The 5900xt is not the ideal card to mod to a 5950U, you just never know what memory will be on that card.

With a 5900nu, you will get 2.2 ram, no need to guess. With that said, it's not even a gaurantee to run at 5950U speed. We won't even talk about using tighter latency with 2.8 ram running at 475/975 for higher performance, that's just out of the question.

I would not run 2.8ns memory over 850 max, why burn up a good card?

Ace, your ram is 2.8

This is the number that will tell you that "F-28 419A", the F-28.

Knowing that, you should not run your memory higher than 850 max. Actually, 800 is a good number. Remember, 800 is already 100mhz over it's rated speed.

Ace

You can also flash your card to a 5950U bios, with lesser speeds. Then maybe you might get higher on the memory, since you will have higher volts and looser timings. Or just be happy with that what you have, and enjoy!


I have a standard Aoelus 5900xt, using the overclock util with
the omega drivers ice got 510 /720 cannot get the memory above 720!

seems stable though?

[Slackfumasta]

I have a BFG FX 5900 XT OC that I can't get above 460/740.

Any suggestions? I can take it out and see what RAM is on it when I get home from work.

[Ace]

I have a BFG FX 5900 XT OC that I can't get above 460/740.

Any suggestions? I can take it out and see what RAM is on it when I get home from work.

Just have look at RAM. Samsung memory is bad for overclocking and you can't raise frequency a lot higher then from factory. Better have a card with Hynix memory.

[Quailane]

If you flash the card to a 5950, it will do those speeds even if you can't reach with 5900xt bios. The core gets more voltage and the ram timings loosen.

[TUK101]

I have the XFX 5900XT also and I have never found a bios that works for the card. I can OC it pretty well though.