I am newbe to linux and ubuntu. I have a confusion, How to find out graphic card vendor of my mother board. I did following,
In terminal I issued
sudo lshw -c video
and got following:
       description: VGA compatible controller
       product: C61 [GeForce 7025 / nForce 630a]
       vendor: NVIDIA Corporation
       physical id: d
       bus info: pci@0000:00:0d.0
       version: a2
       width: 64 bits
       clock: 66MHz
       capabilities: pm msi vga_controller bus_master cap_list rom
       configuration: driver=nouveau latency=0
        resources: irq:22 memory:de000000-deffffff memory:c0000000-cfffffff  memory:dd000000-ddffffff memory:dffc0000-dffdffff
Then I issued
sudo modinfo nouveau
and got following:
filename:       /lib/modules/3.2.0-29-generic-pae/kernel/drivers/gpu/drm/nouveau/nouveau.ko
license:        GPL and additional rights
description:    nVidia Riva/TNT/GeForce
author:         Stephane Marchesin
srcversion:     5399A281CEF0E1FB0CEDBDB
alias:          pci:v000012D2d*sv*sd*bc03sc*i*
alias:          pci:v000010DEd*sv*sd*bc03sc*i*
depends:        drm,drm_kms_helper,ttm,mxm-wmi,video,i2c-algo-bit
intree:         Y
vermagic:       3.2.0-29-generic-pae SMP mod_unload modversions 686 
parm:           agpmode:AGP mode (0 to disable AGP) (int)
parm:           modeset:Enable kernel modesetting (int)
parm:           vbios:Override default VBIOS location (charp)
parm:           vram_pushbuf:Force DMA push buffers to be in VRAM (int)
parm:           vram_notify:Force DMA notifiers to be in VRAM (int)
parm:           duallink:Allow dual-link TMDS (>=GeForce 8) (int)
parm:           uscript_lvds:LVDS output script table ID (>=GeForce 8) (int)
parm:           uscript_tmds:TMDS output script table ID (>=GeForce 8) (int)
parm:           ignorelid:Ignore ACPI lid status (int)
parm:           noaccel:Disable all acceleration (int)
parm:           nofbaccel:Disable fbcon acceleration (int)
parm:           force_post:Force POST (int)
parm:           override_conntype:Ignore DCB connector type (int)
parm:           tv_disable:Disable TV-out detection
parm:           tv_norm:Default TV norm.
        Supported: PAL, PAL-M, PAL-N, PAL-Nc, NTSC-M, NTSC-J,
            hd480i, hd480p, hd576i, hd576p, hd720p, hd1080i.
        Default: PAL
        *NOTE* Ignored for cards with external TV encoders. (charp)
parm:           reg_debug:Register access debug bitmask:
        0x1 mc, 0x2 video, 0x4 fb, 0x8 extdev,
        0x10 crtc, 0x20 ramdac, 0x40 vgacrtc, 0x80 rmvio,
        0x100 vgaattr, 0x200 EVO (G80+).  (int)
parm:           perflvl:Performance level (default: boot)
parm:           perflvl_wr:Allow perflvl changes (warning: dangerous!)
parm:           msi:Enable MSI (default: off)
parm:           ctxfw:Use external HUB/GPC ucode (fermi)
I think vendor is nvidia, right? If yes what drivers should I install for ubuntu 12.04 ?

After installing ubuntu, sound and graphics working without installing any additional drivers. But will performance increase if I install proprietary drivers ?

In software center I found the following:

NVidia binary X.Org driver ('version 173' driver) - not installed,
NVidia binary X.Org driver ('current' driver) - not installed,
NVidia binary X.Org driver ('version 96' driver) - not installed,
Additional Drivers (jockey-kde) - not installed,
Additional Drivers (jockey-gtk) - Installed.
Which of these drivers should I install ? Please help.

Many thanks.