Multi-GPU and screen resolution

Hi!

I have a system (Linux Red Hat 5.5 Tikanga) with two GeForce GTX 480’s, with no other graphics card. I installed cuda driver 3.2, but now I’m having problems with screen resolution. The maximum screen resolution I can get is 1600x1024 (the max is supposed to be 1920x1024 and has worked before), and the only option for the refresh rate is 50 Hz. Is there something I can change so that I can get the optimal resolution and refresh rate?

I also had some general questions about having two NVIDIA gpus as I have. Can I run calculations on both of them even though one of them is hooked up to the monitor? And when I’m running calculations on only one of them, should I use device 1 instead of device 0?

If it helps, when I run the “deviceQueryDrv” program that comes with the SDK I get the following output:
CUDA Device Query (Driver API) statically linked version
There are 2 devices supporting CUDA

Device 0: “GeForce GTX 480”
CUDA Driver Version: 3.20
Total amount of global memory: 1609760768 bytes
Total amount of constant memory: 65536 bytes
Total amount of shared memory per block: 49152 bytes
Total number of registers available per block: 32768
Warp size: 32
Maximum number of threads per block: 1024
Maximum sizes of each dimension of a block: 1024 x 1024 x 64
Maximum sizes of each dimension of a grid: 65535 x 65535 x 1
Maximum memory pitch: 2147483647 bytes
Texture alignment: 512 bytes
Clock rate: 1.40 GHz
Concurrent copy and execution: Yes
Run time limit on kernels: Yes
Integrated: No
Support host page-locked memory mapping: Yes
Concurrent kernel execution: Yes
Device has ECC support enabled: No
Device is using TCC driver mode: No

Device 1: “GeForce GTX 480”
CUDA Driver Version: 3.20
Total amount of global memory: 1610285056 bytes
Total amount of constant memory: 65536 bytes
Total amount of shared memory per block: 49152 bytes
Total number of registers available per block: 32768
Warp size: 32
Maximum number of threads per block: 1024
Maximum sizes of each dimension of a block: 1024 x 1024 x 64
Maximum sizes of each dimension of a grid: 65535 x 65535 x 1
Maximum memory pitch: 2147483647 bytes
Texture alignment: 512 bytes
Clock rate: 1.40 GHz
Concurrent copy and execution: Yes
Run time limit on kernels: No
Integrated: No
Support host page-locked memory mapping: Yes
Concurrent kernel execution: Yes
Device has ECC support enabled: No
Device is using TCC driver mode: No

PASSED

I’m relatively new to cuda and would appreciate any help!

Thank you
–nicoo

Hi!

I have a system (Linux Red Hat 5.5 Tikanga) with two GeForce GTX 480’s, with no other graphics card. I installed cuda driver 3.2, but now I’m having problems with screen resolution. The maximum screen resolution I can get is 1600x1024 (the max is supposed to be 1920x1024 and has worked before), and the only option for the refresh rate is 50 Hz. Is there something I can change so that I can get the optimal resolution and refresh rate?

I also had some general questions about having two NVIDIA gpus as I have. Can I run calculations on both of them even though one of them is hooked up to the monitor? And when I’m running calculations on only one of them, should I use device 1 instead of device 0?

If it helps, when I run the “deviceQueryDrv” program that comes with the SDK I get the following output:
CUDA Device Query (Driver API) statically linked version
There are 2 devices supporting CUDA

Device 0: “GeForce GTX 480”
CUDA Driver Version: 3.20
Total amount of global memory: 1609760768 bytes
Total amount of constant memory: 65536 bytes
Total amount of shared memory per block: 49152 bytes
Total number of registers available per block: 32768
Warp size: 32
Maximum number of threads per block: 1024
Maximum sizes of each dimension of a block: 1024 x 1024 x 64
Maximum sizes of each dimension of a grid: 65535 x 65535 x 1
Maximum memory pitch: 2147483647 bytes
Texture alignment: 512 bytes
Clock rate: 1.40 GHz
Concurrent copy and execution: Yes
Run time limit on kernels: Yes
Integrated: No
Support host page-locked memory mapping: Yes
Concurrent kernel execution: Yes
Device has ECC support enabled: No
Device is using TCC driver mode: No

Device 1: “GeForce GTX 480”
CUDA Driver Version: 3.20
Total amount of global memory: 1610285056 bytes
Total amount of constant memory: 65536 bytes
Total amount of shared memory per block: 49152 bytes
Total number of registers available per block: 32768
Warp size: 32
Maximum number of threads per block: 1024
Maximum sizes of each dimension of a block: 1024 x 1024 x 64
Maximum sizes of each dimension of a grid: 65535 x 65535 x 1
Maximum memory pitch: 2147483647 bytes
Texture alignment: 512 bytes
Clock rate: 1.40 GHz
Concurrent copy and execution: Yes
Run time limit on kernels: No
Integrated: No
Support host page-locked memory mapping: Yes
Concurrent kernel execution: Yes
Device has ECC support enabled: No
Device is using TCC driver mode: No

PASSED

I’m relatively new to cuda and would appreciate any help!

Thank you
–nicoo