Yours is the fastest processor your motherboard supports. Source:
http://h18000.www1.hp.com/products/quickspecs/productbulletin.html#spectype=north_america&type=html&docid=12546
Full list of supported processors:
Processor and Speed
One of the following AMD Sempron Processors with HyperTransport Technology:
AMD Sempron 3400+ Processor (1.8-GHz, 256K L2 cache, 1600-MHz FSB)
X
X
AMD Sempron 3600+ Processor (2.0-GHz, 256K L2 cache, 1600-MHz FSB)
X
X
AMD Sempron LE-1250 Processor (2.2-GHz, 512K L2 cache, 800-MHz FSB)
X
X
AMD Athlon 64 Processors with HyperTransport Technology:
Athlon 64 3500+ Processor (2.2-GHz, 512K L2 cache, 2000-MHz FSB)
X
X
Athlon 64 3800+ Processor (2.4-GHz, 512K L2 cache, 2000-MHz FSB)
X
X
AMD Athlon Single-Core Processors with HyperTransport Technology:
AMD Athlon LE-1640B Processor (2.7-GHz, 512K L2 cache, HT bus 2.0)
X
X
AMD Athlon X2 Dual-Core Processors with HyperTransport Technology:
Athlon X2 BE-2350 Processor (2.1-GHz, 2x512K L2 cache, 2000-MHz FSB)
X
X
AMD Athlon 64 X2 Dual-Core Processors with HyperTransport Technology:
Athlon 64 X2 Dual-Core 3800+ Processor (2.0-GHz, 2x512K L2 cache, 2000-MHz FSB)
X
X
Athlon 64 X2 Dual-Core 3800+ Processor 35-Watt (2.0-GHz, 2x512K L2 cache, 2000-MHz FSB)
X
X
Athlon 64 X2 Dual-Core 4000+ Processor (2.1-GHz, 2x512K L2 cache, 2000-MHz FSB)
X
X
Athlon 64 X2 Dual-Core 4200+ Processor (2.2-GHz, 2x512K L2 cache, 2000-MHz FSB)
X
X
Athlon 64 X2 Dual-Core 4400+ Processor (2.3-GHz, 2x512K L2 cache, 2000-MHz FSB)
X
X
AMD Athlon X2 4450B Processor (2.3-GHz, 1MB L2 cache, HT bus 2.0)
X
X
Athlon 64 X2 Dual-Core 4600+ Processor (2.4-GHz, 2x512K L2 cache, 2000-MHz FSB)
X
X
Athlon 64 X2 Dual-Core 4800+ Processor (2.5-GHz, 2x512K L2 cache, 2000-MHz FSB)
X
X
Athlon 64 X2 Dual-Core 5000+ Processor (2.6-GHz, 2x512K L2 cache, 2000-MHz FSB)
X
X
AMD Athlon X2 5000B Processor (2.6-GHz, 1MB L2 cache, HT bus 2.0)
X
X
Athlon 64 X2 Dual-Core 5200+ Processor (2.6-GHz, 2x1MB L2 cache, 2000-MHz FSB)
X
X
AMD Athlon X2 5200B Processor (2.7-GHz, 1MB L2 cache, HT bus 2.0)
X
X
AMD Athlon X2 5400B Processor (2.8-GHz, 1MB L2 cache, HT bus 2.0)
X
X
Athlon 64 X2 Dual-Core 5600+ Processor (2.8-GHz, 2x1MB L2 cache, 2000 MHz FSB)
X
X
Athlon 64 X2 Dual-Core 6000+ Processor (3.0-GHz, 2x1MB L2 cache, 2000 MHz FSB)
X
X