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Old 07-14-08, 11:46 PM   #1
svega85
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Default GeForce 8400M GS w/128MB is reported as 256MB

I have a Dell 1420 laptop with a GeForce 8400M GS with 128MB of ram but when i run nvidia-settings it says 256MB
OpenGL vendor string: NVIDIA Corporation
OpenGL renderer string: GeForce 8400M GS/PCI/SSE2
OpenGL version string: 2.1.2 NVIDIA 173.14.09
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File Type: log nvidia-bug-report.log (124.2 KB, 207 views)
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Old 07-15-08, 02:43 AM   #2
pe1chl
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Default Re: GeForce 8400M GS w/128MB is reported as 256MB

The driver allocates some system memory for a graphics cache and then reports this as video card memory.
Silly, but it looks like it is just the way it is.
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Old 07-15-08, 03:25 AM   #3
Kirurgs
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Default Re: GeForce 8400M GS w/128MB is reported as 256MB

Hmm, is there any way of disabling cache allocation then?
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Old 07-15-08, 05:04 AM   #4
pe1chl
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Default Re: GeForce 8400M GS w/128MB is reported as 256MB

I don't think so...
(aside from "don't buy a card advertised with turbocache")
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Old 07-15-08, 10:04 AM   #5
svega85
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Default Re: GeForce 8400M GS w/128MB is reported as 256MB

well the older driver reported it correctly and it's also reported correct with windows also on the dell 1420 tech specs it's not advertised with turbocache it's advertised as "NVIDIA® GeForceTM Go 8400M GS with 128MB DDR3 dedicated graphic memory" i think this may be why it went alittle faster with the older driver
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Old 07-15-08, 11:27 AM   #6
pe1chl
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Default Re: GeForce 8400M GS w/128MB is reported as 256MB

Hopefully the Nvidia people have something to say about this.
But I know that the question about turbocache was asked before and it seemed that nothing could be done to disable it or to force the linux driver to report the correct amount of video memory.
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Old 07-15-08, 11:33 AM   #7
xorbe
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Default Re: GeForce 8400M GS w/128MB is reported as 256MB

I bet the previous driver reported dedicated mem, and the newer driver reports both. My Dell laptop has the same 128+128 split though for the equivalent of your card in the 7-series. I would think it's all the same setup basically.
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Old 07-15-08, 03:47 PM   #8
svega85
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Default Re: GeForce 8400M GS w/128MB is reported as 256MB

Quote:
Originally Posted by xorbe View Post
I bet the previous driver reported dedicated mem, and the newer driver reports both. My Dell laptop has the same 128+128 split though for the equivalent of your card in the 7-series. I would think it's all the same setup basically.
which dell because the 1525 do actually have 256MB ?
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Old 07-17-08, 05:17 AM   #9
tzp
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Default Re: GeForce 8400M GS w/128MB is reported as 256MB

Is there a speed penalty for using TurboCache ? Access to the main system memory could be much slower than access to the on-board GDDR RAM, right ?
(if not, I can live with it as I have 3 GB of motherboard RAM.)
I'm not an expert on this, just speculating on cases when the GPU would try to access texture data from the main memory because of the allocated extra mem.

(Thanks to pe1chl for redirecting me here from my thread on a similar problem.)
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Old 07-17-08, 05:21 AM   #10
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Default Re: GeForce 8400M GS w/128MB is reported as 256MB

Quote:
Originally Posted by Kirurgs View Post
Hmm, is there any way of disabling cache allocation then?
According to Wikipedia, there is some possibility for Window$ by modifying the registry.
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Old 07-17-08, 03:04 PM   #11
svega85
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Default Re: GeForce 8400M GS w/128MB is reported as 256MB

Quote:
Originally Posted by tzp View Post
Is there a speed penalty for using TurboCache ? Access to the main system memory could be much slower than access to the on-board GDDR RAM, right ?
(if not, I can live with it as I have 3 GB of motherboard RAM.)
I'm not an expert on this, just speculating on cases when the GPU would try to access texture data from the main memory because of the allocated extra mem.

(Thanks to pe1chl for redirecting me here from my thread on a similar problem.)
yeah the mother board ram is slower than the video card ram
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Old 07-17-08, 06:48 PM   #12
AaronP
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Default Re: GeForce 8400M GS w/128MB is reported as 256MB

Quote:
Originally Posted by svega85 View Post
yeah the mother board ram is slower than the video card ram
Yes, but accessing system memory from the GPU is still faster than running out of GPU-accessible memory and performing the rendering in software.
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