NVIDIA GeForce 7900GT 256MB
Written by Michael Larabel in Graphics Cards on 9 March 2006. Page 5 of 6. Add A Comment

The below information is the output from various Linux commands to aide in the development of NVIDIA-related utilities to support the GeForce 7900GT. The development output includes using lspci, to list all PCI devices, in a very verbose mode (lspci -vv) and the popular NVClock utility. From the Linux NVClock, we used the -i and -D parameters to display the related information. As can be seen, the GeForce 7900 series are not presently supported by the NVClock CVS, and lacks the thermal readings, and various other measurements. The 7900GT information displayed was the architecture, and was displayed as the NV49 A2. The PCI ID for the device is 0x291. The core and memory clock speeds were both reporting inaccurate values of -2147483MHz. The memory interface was also improperly displayed as 128-bit, rather than 256-bit. Fedora Core 5 Test 3 was used with the 2.6.15 Linux kernel, NVClock was acquired from the SourceForge CVS server on March 06, 2006.

# nvclock -D

--- nVidia Geforce 7900GT GPU registers ---
NV_PMC_BOOT_0 (0x0): 049100a2
NV_10F0 (0x10f0): 00007fff
NV_1540 (0x1540): 73ffff3f
NV_15B0 (0x15b0): 40000000
NV_15B4 (0x15b4): 08000000
NV_15B8 (0x15b8): 98800f08
NV_15F0 (0x15f0): 00000000
NV_15F4 (0x15f4): 00000000
NV_15F8 (0x15f8): 7fffffff
NV_PFB_CFG0 (0x100200): 43002073
NV_PFB_TIMING0 (0x100220): 0916271f
NV_PFB_TIMING1 (0x100224): 0c01070c
NV_PFB_TIMING2 (0x100228): 2028060a
NV_NVPLL_COEFF_A (0x680500): 00000000
NV_MPLL_COEFF_A (0x680504): 00000000
NV_VPLL_COEFF (0x680508): 00030e02
NV_PLL_COEFF_SELECT (0x68050c): 00000004
NV_NVPLL_COEFF_B (0x680570: 00000000
NV_MPLL_COEFF_B (0x680574: 00000000

# nvclock -i

-- General info --
Card:           nVidia Geforce 7900GT
Architecture:   NV49 A2
PCI id:         0x291
GPU clock:      -2147483.750 MHz
Bustype:        PCI-Express

-- Memory info --
Amount:         256 MB
Type:           128 bit DDR
Clock:          -2147483.648 MHz

# lspci -vv

05:00.0 VGA compatible controller: nVidia Corporation Unknown device 0291
	(rev a1) (prog-if 00 [VGA])
        Subsystem: eVga.com. Corp. Unknown device c565
        Control: I/O+ Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr-
	Stepping- SERR- FastB2B-
        Status: Cap+ 66MHz- UDF- FastB2B- ParErr- DEVSEL=fast >TAbort- SERR- 

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