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GeForce 8800GTX problems

Last response: in Graphics & Displays
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Hi. I bought a new computer yesterday.
MB Asus P5B Deluxe
CPU Intel Core 2 Duo 6600
RAM Corsair 2x1024 Dominator
HDD Samsung SATA2 400GB 16MB Cache
VGA Msi Geforce 8800GTX 768MB
PSU Enermax G565AX-VE(G) 535W
LCD Samsung 204B 20.1"

I have following problems... When I go via DVI on 1280x1024 it goes OK, when I turn to 1600x1200 the LCD start turning off or blinking... when I use the analog input everything goes Ok even on the resolution of 1600x1200. May it be caused by the PSU? I heard there must be more ampers on 12V. On the PSU is said the 12V together gives output of 34A. Is the PSU weak for this VGA card? Next problem is when I was playing Oblivion something some creepy sounds goes from the mashine, like squeaking. When I press ESC the menu appears and the sound is gone. Then I press resume and it squeaks again.

Please help me, cause I am absoulutely dissapointed, you know how much cost this whole computer set up

More about : geforce 8800gtx problems

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try drivers and reinstalling Direct X, if that doesn't work have a look into if the PSU is the problem, the way that said might save you some money (you might not need to get another PSU) :) 
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I have my system running on an Antec Neo HE 550w with absolutely no issues.

Athlon 64 4000+
2gb OCZ PC3200
Asus A8N SLI
36gb Raptor
74gb Raptor
Sony DVD Burner
Lite-On DVD-rom
Xfx GeForce 8800GTX

I even have the 8800 clocked to 620mhz/935mhz and everything runs smooth as butter. Not sure of the price difference between the Neo and the Thermaltake 700w, but if the Thermaltake costs more I see no reason to go with it over the Neo HE

Quote:
I have my system running on an Antec Neo HE 550w with absolutely no issues.

Athlon 64 4000+
2gb OCZ PC3200
Asus A8N SLI
36gb Raptor
74gb Raptor
Sony DVD Burner
Lite-On DVD-rom
Xfx GeForce 8800GTX

I even have the 8800 clocked to 620mhz/935mhz and everything runs smooth as butter. Not sure of the price difference between the Neo and the Thermaltake 700w, but if the Thermaltake costs more I see no reason to go with it over the Neo HE


Well something else that should be mentioned is its usually hit and miss with dual rails on a high end system. Sometimes depending on your system config the power is properly split over the 2 rails and sometimes all the components try to draw power off of the same rail pretty much leaving the other one near useless.

I have gone through struggles with dual 12v rail psu's and never again will I take my chances with one.

I now have the pcpowercooling 750watt psu with a stout 60amp single 12v rail that will distribute power as needed to all the components without having to worry about the split.


jonnyGURU 01-04-2006 05:58 AM
*sigh*

Ok.

On most power supplies you have TWO 12V rails.

12V2 supplies power to the CPU. That's it. Your CPU may need 7A or 10A or whatever, depending on the CPU. Athlon XP, Pentium 4, dual core, etc.

12V2 typically has hellacious overhead. But that's Ok because the cost difference between making a power supply that can regulate 14A on the 12V2 and 20A on the 12V2 is a dollar. More money is spent on "Titanium" mirror finishes. ;) 

12V1 is the one that gets a lot of stress. Your hard drives motors, fans, lights, optical drive motors, PCI-e video cards, etc are all on your 12V1. You can easily end up putting a 20A load on this rail.

Hmmm.. isn't that strange? Both rails have 20A capability. Interesting.

There's exceptions to this, of course. Take a quad rail power supply. You have one rail for your second CPU (via the extra two 12V wires on the EPS 8-pin connector) and one rail for hard drives. You'll also notice that the second CPU rail is the same as 12V2 and the drive rail is something relatively low like 8A. Despite this, one, two or three rails, the maximum combined output of the 12V rail is not that much differernt.

This is because the transistors that regulate these voltages are still being fed by the same switching transformer. The maximum output getting to these regulators is limited. This is where your maximum combined 12V comes from.

So you have "brand A", which is a single 12V rail PSU, and "brand B" which is a dual 12V rail. "Brand A" has a 34A 12V rail and "Brand B" has a pair of 20A 12V rails. So the "brand B" is better, right? Not necessarily.

Look at the label of "brand B" and underneath the two 12V rails it says: "Maximum Combined Wattage 408W." That's 34A. So, as far as 12V goes, the dual 20A rails can't really put out more juice than the single rail "brand A."

Open the two PSU's up and you find that they're both made by Fung Choo Flower Access and Bicycle Company of East Industrial Section, Szchehuan, China. The only difference is the additional transistor stuck to one of the heatsinks in the middle of the guts. That's it. Everything else is the same.

Now I personally prefer dual 12V rails. But I'm going to explain to you why a single 12V rail is actually better!

You know that 12V2 I told you about that can do 20A but you'll never need it? That's pretty much all overhead in a single CPU build. Even a dual core. You only need half of that. Let's say 12V1 really gets up to 20A. What's that? 30A? Let's say the maximum combined wattage for the two 20A rails is 30A. Getting jipped? Not quite. But you're left with 10A extra that's simply not usable! With a single 12V rail, you can at least have "access" to all of the additional juice. Every little bit helps, right? ;) 

So why even bother with dual 12V rails? Because a single 12V rail that can actually SUSTAIN it's maximum wattage for any period of time without blowing up is very expensive. And they DO NOT run very efficient at the higher outputs. Two 20A rails putting out 34A runs cooler and more efficienctly than one 34A rail for the same cost in materials.

So why bother with a power supply with a high 12V2? Well, there is always the possibility that the consumer will have dual CPU's and need more power. And the likelihood that they will also have some PCI-e cards sucking up juice on the 12V1 isn't likely in that kind of build. If they do have multiple CPU's and high end PCI-e cards and are only using a 400W or 500W power supply, they're a fool. And of course, "overhead." Bigger, better, faster, grunt, grunt, grunt.

The other excuse is pure marketing fluff. What looks better on the shelf? 500W or 400W? 500W, of course. But what if the 400W has 34A on the 12V rail and the 500W has 18A? I'd take the 400W! This is where blanket statements like "must have at least a 400W power supply to use" piss me off. So if I have a 380W Seasonic, I'm up shit's creek so I should run out and buy a 500W Powmax?!!?! But the alternative is to go into long, elaborate explainations of how 12V rail ratings work and your video card or DFI manual would be twice as thick. That's right.. A DFI manual could have useful information in it! Who'd a thunk it?

So in a dual 12V rail PSU, the 12V1 is the most important. But the combined is also important because overhead is good and more output available on the combined 12V rails is simply put a sign of better quality, and quite honestly better voltage regulation and better efficiency at higher outputs then you would find in a power supply with lower output capability.

Remember: Almost everyone here is only pulling 250W from the wall. That's under 200W in your PC. Yet most of us have at least a 400W power supply. ;) 

man that sounds kinda bad... It sounds like speakers, you know sometimes they make that noise (cheap ones)

It doesn't sound like its a fan issue...Interference from alien lifeforms wanting you 8800gtx? :? :lol: 
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