how to diagnose graphics card (NVIDIA) in Windows

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I have Gigabyte NVIDIA 440 GT

I'm afraid that something is wrong with the graphics card, graphic lagging in games.

I recently updated driver.

Is there any tool to diagnose the NVIDIA graphics cards.

I'm afraid that the graphics card can overheat

The nVidia drivers don't seem to have good diagnostics (unless they're well hidden!) Only the drivers from the manufacturer might. (Gigabyte, ASUS, etc.)

There's probably nothing that can be diagnosed, as such: if the card is working then... it's likely Ok.
Generally failures manifest as corrupted or no display, visual glitches, insane flickering or other artifacts.

nVidia has a system utility available, which is the nearest I've seen to diagnostics. It's mainly concerned with overclocking and performance tweaking, which isn't what you're after - but amongst that stuff is temperature monitoring. (I think this is probably also available from stand-alone, generic system utilities - Googling with nVidia GPU monitor may be useful).
Also, there's a chance the system utility doesn't support the card you have.
http://www.nvidia.com/object/nvidia-sys ... river.html

My rules.

1. If something happens after you did something, UNDO IT and see if it goes away. Newer does not = better. Get your OEM driver that came with the card, uninstall the new driver and delete it, put the OEM back on and see if it fixes the problem.

2. If not, check if the cooling fan on the card is gummed up with dust or has a failed cooling fan. Artifacts and crashes can happen when the cooling fan can't do/isn't doing the job.

3. Problems with the PSU could affect the video card, but most times it results in spontaneous rebooting of the PC.

The best way is to update its FIRMWARE to the latest