Winstone 2004	Source: Zdnet

Content Creation Winstone 2004 is a system-level, application-based benchmark that measures a PC's overall performance when running top, Windows-based, 32-bit, content creation applications in Windows XP.

Business Winstone 2004 runs real applications through a series of scripted activities and uses the time a PC takes to complete these activities to produce its performance scores.

Winstone 2004
Business Winstone 2004:	Points	Ranking
ASRock K8 Combo-Z/ASR (Ali M1689 200/400)	27
Soltek SL-K8TPro-939 (K8T800 Pro 200/400)	28.6
Epox 9NDA3+ (NF3 Ultra 200/400)	29.4
Albatron K8X890 Pro II (K8T890 200/400)	27.3
MSI RS480M2-IL (RS480 200/400)	29.1
MSI K8N Neo4 Platinum (NF4 Ultra 200/400)	32.1
Chaintech Zenith VNF4 Ultra (NF4 Ultra 200/400)	30.3
MSI K8N Neo4 Platinum/SLI (NF4 SLI 200/400)	28.6
DFI LANParty NF4 SLI-DR (NF4-SLI 200/400)	32.2
Foxconn WinFast NF4K8AC-8EKRS (NF4 200/400)	32.1
Content Creation 2004:	Points	Ranking
ASRock K8 Combo-Z/ASR (Ali M1689 200/400)	34.7
Soltek SL-K8TPro-939 (K8T800 Pro 200/400)	37.2
Epox 9NDA3+ (NF3 Ultra 200/400)	35.9
Albatron K8X890 Pro II (K8T890 200/400)	36.2
MSI RS480M2-IL (RS480 200/400)	36.4
MSI K8N Neo4 Platinum (NF4 Ultra 200/400)	39.2
Chaintech Zenith VNF4 Ultra (NF4 Ultra 200/400)	39.5
MSI K8N Neo4 Platinum/SLI (NF4 SLI 200/400)	35.1
DFI LANParty NF4 SLI-DR (NF4-SLI 200/400)	39.7
Foxconn WinFast NF4K8AC-8EKRS (NF4 200/400)	39.2

The Foxconn motherboard performs quite well in the Winstone 2004 benchmarks as well and fights for second place just behind the high end DFI LANParty NF4 SLI-DR motherboard.

Winbench 99	Source: Zdnet

WinBench 99 is a subsystem-level benchmark that measures the performance of a PC's graphical, disk, and video subsystems in a Windows environment. WinBench 99's tests can run on Windows 95, Windows 98, Windows NT, Windows 2000, and Windows XP systems.

Winbench 99
Business Disk WinMark:	Points	Ranking
ASRock K8 Combo-Z/ASR (Ali M1689 200/400)	30000
Soltek SL-K8TPro-939 (K8T800 Pro 200/400)	9990
Epox 9NDA3+ (NF3 Ultra 200/400)	19200
Albatron K8X890 Pro II (K8T890 200/400)	10700
MSI RS480M2-IL (RS480 200/400)	13600
MSI K8N Neo4 Platinum (NF4 Ultra 200/400)	28200
Chaintech Zenith VNF4 Ultra (NF4 Ultra 200/400)	27900
MSI K8N Neo4 Platinum/SLI (NF4 SLI 200/400)	4060
DFI LANParty NF4 SLI-DR (NF4-SLI 200/400)	27100
Foxconn WinFast NF4K8AC-8EKRS (NF4 200/400)	28300
High-End Disk WinMark:	Points	Ranking
ASRock K8 Combo-Z/ASR (Ali M1689 200/400)	51800
Soltek SL-K8TPro-939 (K8T800 Pro 200/400)	34900
Epox 9NDA3+ (NF3 Ultra 200/400)	42600
Albatron K8X890 Pro II (K8T890 200/400)	38500
MSI RS480M2-IL (RS480 200/400)	46800
MSI K8N Neo4 Platinum (NF4 Ultra 200/400)	61500
Chaintech Zenith VNF4 Ultra (NF4 Ultra 200/400)	62900
MSI K8N Neo4 Platinum/SLI (NF4 SLI 200/400)	31900
DFI LANParty NF4 SLI-DR (NF4-SLI 200/400)	60700
Foxconn WinFast NF4K8AC-8EKRS (NF4 200/400)	62000
Business Graphics WinMark:	Points	Ranking
ASRock K8 Combo-Z/ASR (Ali M1689 200/400)	1580
Soltek SL-K8TPro-939 (K8T800 Pro 200/400)	1700
Epox 9NDA3+ (NF3 Ultra 200/400)	1560
Albatron K8X890 Pro II (K8T890 200/400)	1640
MSI RS480M2-IL (RS480 200/400)	1780
MSI K8N Neo4 Platinum (NF4 Ultra 200/400)	1620
Chaintech Zenith VNF4 Ultra (NF4 Ultra 200/400)	1690
MSI K8N Neo4 Platinum/SLI (NF4 SLI 200/400)	916
DFI LANParty NF4 SLI-DR (NF4-SLI 200/400)	1680
Foxconn WinFast NF4K8AC-8EKRS (NF4 200/400)	1700
High-End Graphics WinMark:	Points	Ranking
ASRock K8 Combo-Z/ASR (Ali M1689 200/400)	2470
Soltek SL-K8TPro-939 (K8T800 Pro 200/400)	2650
Epox 9NDA3+ (NF3 Ultra 200/400)	2480
Albatron K8X890 Pro II (K8T890 200/400)	2560
MSI RS480M2-IL (RS480 200/400)	2990
MSI K8N Neo4 Platinum (NF4 Ultra 200/400)	2600
Chaintech Zenith VNF4 Ultra (NF4 Ultra 200/400)	2570
MSI K8N Neo4 Platinum/SLI (NF4 SLI 200/400)	2130
DFI LANParty NF4 SLI-DR (NF4-SLI 200/400)	2600
Foxconn WinFast NF4K8AC-8EKRS (NF4 200/400)	2620

Considering Serial ATA II does not give any real world performance boost to the HDD subsystem (yet), I think it's a feature that most will not miss. HDD performance is good all around as is graphics.