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5200ultra help

B

Bodega

Gawd
Joined
Feb 7, 2004
Messages
776
i got en evga 5200ultra from newegg and im havin a bit of a mem problem..

in the video bios screen thing at the very beginning of startup, it'll say 64.0mb, not 128mb. If i restart a couple times it'll say 128mb, but then it'll crash or just not post. only way to get it back to 64 is unplugging my comp and plugging it back in. Very wierd problem.. never seen anything like it. I've tried the card on 4 different systems and i always get the same problem.

evga 5200ultra, nvidia referene design, 128bit, 128mb
 
Originally posted by ati_azn
go to your mobo bios screen and change the agp size from 64mb to 128mb
Click to expand...
That has absolutely nothing to do with it.
 
Ok, here you go. Some true info about AGP aperture:

Reference Link

First of all, AGP Aperture memory will not be used until your video card's on-board memory is running low. That means it will usually not impact your gaming performance because developers are trying hard to not exceed the on-board memory limits.
The bigger your video memory, the smaller your Aperture Size could be. However with later games requiring more and more texture memory a good number seems to be 128MB Aperture Size for all cards with 64 MB to 256 MB Video RAM.
Setting the Aperture Size to HUGE values will not increase performance because this merely sets the maximum amount of physical memory that can be used. It only makes the GART Table bigger because every 4K page has its own entry, no matter if allocated or not.
Setting the Aperture Size to too small values could result in running out of available texture memory especially on a low-mem video card. It is also possible that developers make use of the GART's features by creating textures as 'non-local'.


When using an AGP card the video memory on the graphics adapter is mapped into the 4 GB memory address space (above the region of the physical installed memory). Any accesses to this memory region are directly forwarded to the video memory, greatly increasing transfer rates. However in earlier days of video cards graphics memory was rather limited and ran out quickly (a single 32-bit 512x512 MIP-mapped texture consumes ~1.5 MB) so AGP added a mechanism to use the system's main memory as additional storage for graphics data such as textures. This is what the AGP Aperture is. Usually directly below the mapped video memory the system reserves a contiguous space of addresses the size of your Aperture (no physical memory will be consumed at this time).
When free video RAM is running low the system dynamically allocates 4K sized pages of system memory for use as AGP Aperture Memory. The problem with this dynamic allocation is that in many cases the pages are spread in a non-contiguous form throughout the physical memory. Accessing these pages directly would hinder performance because of scattering/gathering requiring extra logic. To get around this limitation the GART (Graphics Address Remapping Table) which is implemented in hardware in the Northbridge's Memory Controller Hub provides an automatic physical-to-physical mapping between the scattered pages and the AGP Aperture.
Click to expand...
His problem obviously happens when the video card posts. This happens before the motherboard posts. It could be a faulty card, a video BIOS problem, or more likely his PSU isn't delivering enough power fast enough for the card to post correctly. I have seen it first hand with my old GF2Pro 32MB card once in a great while. A quick press of the reset button, and it would post correctly.
 
when it does post 128, one of two things happen.
- after video bios, nothing happen.. ever
- after video bios the screen will just looked messed up, with colorful lines running down the screen. no way to make out if its in windows or anything
 
If the card is under warranty, I would suggest returning it. There is probably nothing you could do to fix it.
 
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