I decided that socket A mobo with 850 Mhz processor was just not enough.
I upgraded to a socket AM3 motherboard and a Sempron 145 single core (2.8 Ghz). I paid $20 plus shipping on the motherboard sold "as is" for "parts only" since it was open box untested by a bulk buyer on EBay. I'd checked others who'd done the same and only a few got a bad board. Mine worked, yeah. I paid $25 for the processor + HSF. I have another same CPU and HSF still in the original AMD box, just in case, same price. The case was on sale at tigerdirect months ago for $20 free shipping, so I bought two of them, one used for wife's upgrade. The PSU was Antec 450W continuous with 80% efficiency for about $40 (not 80 plus since has manual voltage switch). Added a $10 3.5" media center with USB port and flash media reader slots. DVDRW drive wa Lite-On I think, it was under $20. The hard drives are legacy, already had them. No case fan needed. No floppy drive installed. The 4GB RAM was around $40 in all.
So for about $150 spent gained quite a bit more capability for Linux.
I might put the ASUS mobo with the CPU, RAM and HSF on EBay and probable get about $20 back on it, making it even cheaper upgrade.
I have no problems on broadband service, running Youtube videos at 720p HD and also catching up missed TV programs. No problems rendering them, no buffering, no delays. However for my wife's PC running W7 and hooked to a HDTV, I did put her in a dual core 3.2 Ghz processor on an AM3 motherboard.
My specs as seen in Linux;
mint14@mint14 ~ $ inxi -v2
System: Host: mint14 Kernel: 3.5.0-28-generic i686 (32 bit) Desktop: N/A Distro: Linux Mint 14 Nadia
Machine: Mobo: Gigabyte model: GA-MA78GPM-UD2H version: x.x Bios: Award version: F7 date: 10/08/2009
CPU: Single core AMD Sempron 140 (-UP-) clocked at 2712.549 MHz
Graphics: Card: Advanced Micro Devices [AMD] nee ATI RS780 [Radeon HD 3200]
X.Org: 1.13.0 drivers: ati,vesa,radeon (unloaded: fbdev,fglrx) Resolution: email@example.com
GLX Renderer: N/A GLX Version: N/A
Network: Card: Realtek RTL8111/8168B PCI Express Gigabit Ethernet controller driver: r8169
Drives: HDD Total Size: 280.1GB (3.3% used) 1: model: ST3120814A
2: model: WDC_WD1600AAJB
Info: Processes: 138 Memory: 784.6/3908.2MB Client: Shell inxi: 1.8.4
mint14@mint14 ~ $