A typical search in the internet will convince you that socket LGA 775 motherboards are much more than those with 478. We found three low cost motherboards for you, which are listed below.

  I) ASUS P5RD1-VM

Form factor: Micro ATX 24.4cm x 21.8cm.
CPU: Socket 775.
Supported processors: Intel Pentium 4 / Pentium D, Celeron - 775 pin.
FSB speed: 1066 / 800 / 533 MHz.
Chipset: ATI Radeon Xpress 200 / ULI M1573.
Communication Ports: 1 x PCI Express x16 slot (discrete graphics card), 2 x PCI slots, 1x PCI Express x1, 4 USB 2.0 (you can add 4 more ports externally, 2 PS2, 1 Parallel, 1 x COM ports, 6-Channel Audio I/O, 1 x RJ45, 1 x VGA.
Hard Disk support: up to 4 UltraDMA 100 / 133 devices and 4 more S-ATA devices. It also supports RAID 0, RAID 1, RAID 0+1, JBOD.
RAM sockets: 2 x 184-pin DIMM Sockets DDR. Supports DDR 333 / 400 up to 2GB and Dual Channel Memory Architecture.
Additional characteristics: 6 channel embedded sound card, 10/100 Mbit/s LAN, embedded Radeon X300 based graphics.
BIOS: 4 Mb Flash ROM,AMI BIOS, PnP, DMI2.0, WfM2.0, SM BIOS 2.3,ASUS EZ Flash.

  II) ASROCK 775TWINS-HDTV



Form factor: Micro-ATX, 24.4 x 24.4 cm.
CPU: Socket 775.
Supported CPUs: Dual Core Pentium XE and Pentium D / Pentium 4 / Celeron D processor.
FSB speed: 1066/ 800/ 533 MHz.
Chipset: ATI Radeon XPRESS 200, ULi 1573.
Communication ports: 1 x PCI Express x16 slot, 2 x PCI slots, 1 x PCI Express x 1 slot, 1 x AMR slot, 4 x USB 2.0 (4 more can be added externally), 1 x Parallel, 1 x Serial (COM1), 1 x PS/2 Keyboard, 1 x PS/2 Mouse, Side Speaker / Rear Speaker / Central / Bass / Line in / Front Speaker / Microphone, 1 x RJ45 LAN Jack, 1 x VGA supporting HDTV.
Hard disk support: 4 x Serial ATA devices in RAID 0, 1, 0+1, JBOD and 4 x Ultra DMA 133/ 100/ 66 devices.
RAM sockets: 2 x 184-pin DDR dimm sockets support up to 2GB, DDR 400/ 333/ 266 and 2 x DDR II dimm slots DDR II 667/533 up to 2GB. Attention you cannot use DDR2 and DDR1 simultaneously.
Additional characteristics: onboard audio card 8 channels audio codec RealTek ALC850, LAN card PHY RTL8201CL 10/ 100 Mbps, onboard vga ATi X300 with 128 Mb shared from the system's Ram.
BIOS: 4Mb AMI BIOS, AMI Legal BIOS, ""Plug and Play"", ACPI 1.1 Compliance Wake Up Events, Supports jumperfree, SMBIOS 2.3.1 Support.

   III)MICROSTAR MSI PM8M2-V



Form factor: MicroATX24.5 cm(L) x 19 cm(W).
CPU: Socket 775.
Supported processors: Pentium 4 5XX, 6XX, Celeron D 3xx.
FSB speed: 800/533 MHz.
Chipset:
  - Northbridge: VIA P4M800
  - Southbridge: VIA VT8237R
Communication ports: 1 x AGP, 2 x PCI, 4 USB 2.0 ports (4 more can be added externally), 1 x Parallel, 1 x Serial (COM 1), 1 x VGA, 1 x PS/2 Keyboard, 1 x PS/2 Mouse, 1 x Audio I/O (Line-in/Line-out/MIC), 1 x RJ45 LAN.
Hard Disk support: 2 x Ultra DMA133/100/66 up to 4 IDE devices, 2 x Serial ATA.
RAM sockets: 2 x DDR333/400 up to 2GB.
Additional characteristics: onboard vga S3 UniChrome Pro integrated graphics, AC'97 link Realtek ALC655 2/6 channel S/W audio codec, Realtek 8201CL Fast Ethernet PHY.
  All these motherboards can be combined with a 2,93Ghz Celeron for a low end Htpc or a Pentium M2 640 at 3,2GHz for those who need more power. We don't recommend higher cpus for this form factor except if you want to use a desktop HTPC case. As we said in the introduction session we need a stable, cold and low noise HTPC in our living room. If you want your Htpc to support DDR II RAM then ASUS is ok for you. If you want 8 channel sound then Asrock is the best choice.
  Also all our choices have onboard Lan Ethernet cards. So it is easy to make a lan in your home with another PC. All these motherboards cost almost the same. The first two cost about 70euros and they support DDR and DDR II dimms so you can choose whatever you want. Although the third motherboard cost about 60e and is the most affordable choice.