it should be SFF. pretty similar to this build
http://www.aventissystems.com/Desktop-Dell-Optiplex-p/100871.htm
and the link is like this
Processor (CPU)
CPU Name Intel® Core™ i5-3470 CPU @ 3.20GHz
Threading 1 CPU - 4 Core - 4 Threads
Frequency 3391.91 MHz (34 * 99.76 MHz)
Multiplier Current: 34 / Min: 16 / Max: 36
Architecture Ivy Bridge / Stepping: N0 / Technology: 22 nm
CPUID / Ext. 6.A.9 / 6.3A
IA Extensions MMX, SSE, SSE2, SSE3, SSSE3, SSE4.1, SSE4.2, EM64T, VT-x, AES, AVX
Caches L1D : 32 KB / L2 : 256 KB / L3 : 6144 KB
Caches Assoc. L1D : 8-way / L2 : 8-way / L3 : 12-way
Microcode Rev. 0x000001B
TDP / Vcore 77 Watts / 1.131 Volts
Temperature 58 °C / 136 °F
Type Retail (Stock Frequency : 3200 MHz)
Cores Frequencies #00: 3391.91 MHz #01: 3391.91 MHz #02: 3391.91 MHz #03: 3391.91 MHz
Motherboard
Model Dell 0T10XW
Socket Socket 1155 LGA
North Bridge Intel Ivy Bridge rev 09
South Bridge Intel H61 rev B2
BIOS Dell Inc. A08 (12/07/2012)
Memory (RAM)
Total Size 8192 MB
Type Dual Channel (128 bit) DDR3-SDRAM
Frequency 798.1 MHz - Ratio 1:6
Timings 11-11-11-28-1 (tCAS-tRC-tRP-tRAS-tCR)
Slot #1 Module Hyundai Electronics 4096 MB (DDR3-1600) - P/N: HMT351U6CFR8C-PB
Slot #2 Module Hyundai Electronics 4096 MB (DDR3-1600) - P/N: HMT351U6CFR8C-PB
Graphic Card (GPU)
GPU Type NVIDIA GeForce GT 710 (GK208) @ 135 MHz
GPU Brand ASUSTeK Computer Inc.
GPU VRAM 2048 MB @ 405 MHz
Storage (HDD/SSD)
Model #1 Western Digital WDC WD1003FBYX-05Y7B
Capacity #1 1000 GB
Display
Screen #1 Dell Computer DELL 1909W (DELA03C)
Screen #1 Spec 19.1 inches (48.5 cm) / 1440 x 900 pixels @ 56-75 Hz
Miscellaneous
Windows Version Microsoft Windows 7 (6.1) Professional 64-bit
Windows Subver. Service Pack 1 (Build 7601)
CPU-Z Version 1.83.0 (64 bit)