Futuremark 3DMark05 1.2.0	Source: FutureMark

3DMark05 is best suited for the latest generation of DirectX9.0 graphics cards. It is the first benchmark to require a DirectX9.0 compliant hardware with support for Pixel Shaders 2.0 or higher! By combining high quality 3D tests, CPU tests, feature tests, image quality tools, and much more, 3DMark05 is a premium benchmark for evaluating the latest generation of gaming hardware.

FutureMark 3DMark05 1.2.0
Overall:	Points	Ranking
ASRock AM2V890-VSTA (K8T890 200/800 A64 5000+)	7896
Albatron KM51PV-AM2 (GF6150 200/800 A64 5000+)	7908
MSI K9N SLI Platinum (NF 570 SLI 200/800 A64 5000+)	7866
ECS PN2 SLI2+ (NF 680i SLI 200/800 Core 2 Duo GeForce 7800GTX Single)	8086
ECS PN2 SLI2+ (NF 680i SLI 200/800 Core 2 Duo GeForce 7800GTX SLI)	13142
MSI P6N SLI Platinum (NF 650i 200/800 Core 2 Duo GeForce 7800GTX Single)	8076
MSI P6N SLI Platinum (NF 650i 200/800 Core 2 Duo GeForce 7800GTX SLI)	13089
Asus P5N32-SLI Premium (NF 590 SLI 200/800 Core 2 Duo GeForce 7800GTX Single)	8104
Asus P5N32-SLI Premium (NF 590 SLI 200/800 Core 2 Duo GeForce 7800GTX SLI)	13092
Foxconn 975X7AB-8EKRS2H (975X 200/800 Core 2 Duo)	8015
MSI P965 Platinum (P965 200/800 Core 2 Duo)	8027
ECS PN1 SLI2 Extreme (NF 590 SLI 200/800 Core 2 Duo GeForce 7800GTX Single)	8054
ECS PN1 SLI2 Extreme (NF 590 SLI 200/800 Core 2 Duo GeForce 7800GTX SLI)	13126
CPU:	Points	Ranking
ASRock AM2V890-VSTA (K8T890 200/800 A64 5000+)	6621
Albatron KM51PV-AM2 (GF6150 200/800 A64 5000+)	6718
MSI K9N SLI Platinum (NF 570 SLI 200/800 A64 5000+)	6513
ECS PN2 SLI2+ (NF 680i SLI 200/800 Core 2 Duo GeForce 7800GTX Single)	9437
ECS PN2 SLI2+ (NF 680i SLI 200/800 Core 2 Duo GeForce 7800GTX SLI)	9385
MSI P6N SLI Platinum (NF 650i 200/800 Core 2 Duo GeForce 7800GTX Single)	9485
MSI P6N SLI Platinum (NF 650i 200/800 Core 2 Duo GeForce 7800GTX SLI)	9458
Asus P5N32-SLI Premium (NF 590 SLI 200/800 Core 2 Duo GeForce 7800GTX Single)	8618
Asus P5N32-SLI Premium (NF 590 SLI 200/800 Core 2 Duo GeForce 7800GTX SLI)	8589
Foxconn 975X7AB-8EKRS2H (975X 200/800 Core 2 Duo)	9525
MSI P965 Platinum (P965 200/800 Core 2 Duo)	9712
ECS PN1 SLI2 Extreme (NF 590 SLI 200/800 Core 2 Duo GeForce 7800GTX Single)	9168
ECS PN1 SLI2 Extreme (NF 590 SLI 200/800 Core 2 Duo GeForce 7800GTX SLI)	8914

The ECS PN1 SLI2 Extreme motherboard allows us to run two GeForce 7800GTXs in SLI - the performance boost from that is definitely noticeable. With one videocard, performance is still very good, and the ECS motherboard outperforms the rest of the crowd in the overall portion of this benchmark.

Futuremark 3DMark06 1.0.2	Source: FutureMark

3DMark06 is the worldwide standard in advanced 3D game performance benchmarking. A fundamental tool for every company in the PC industry as well as PC users and gamers, 3DMark06 uses advanced real-time 3D game workloads to measure PC performance using a suite of DirectX 9 3D graphics tests, CPU tests, and 3D feature tests. 3DMark06 tests include all new HDR/SM3.0 graphics tests, SM2.0 graphics tests, AI and physics driven single and multiple cores or processor CPU tests and a collection of comprehensive feature tests to reliably measure next generation gaming performance today.

Futuremark 3DMark06 1.0.2
Overall:	Points	Ranking
ASRock AM2V890-VSTA (K8T890 200/800 A64 5000+)	4442
Albatron KM51PV-AM2 (GF6150 200/800 A64 5000+)	4450
MSI K9N SLI Platinum (NF 570 SLI 200/800 A64 5000+)	4437
ECS PN2 SLI2+ (NF 680i SLI 200/800 Core 2 Duo GeForce 7800GTX Single)	4494
ECS PN2 SLI2+ (NF 680i SLI 200/800 Core 2 Duo GeForce 7800GTX SLI)	7525
MSI P6N SLI Platinum (NF 650i 200/800 Core 2 Duo GeForce 7800GTX Single)	4463
MSI P6N SLI Platinum (NF 650i 200/800 Core 2 Duo GeForce 7800GTX SLI)	7492
Asus P5N32-SLI Premium (NF 590 SLI 200/800 Core 2 Duo GeForce 7800GTX Single)	4490
Asus P5N32-SLI Premium (NF 590 SLI 200/800 Core 2 Duo GeForce 7800GTX SLI)	7522
Foxconn 975X7AB-8EKRS2H (975X 200/800 Core 2 Duo)	4496
MSI P965 Platinum (P965 200/800 Core 2 Duo)	4465
ECS PN1 SLI2 Extreme (NF 590 SLI 200/800 Core 2 Duo GeForce 7800GTX Single)	4498
ECS PN1 SLI2 Extreme (NF 590 SLI 200/800 Core 2 Duo GeForce 7800GTX SLI)	7536
CPU:	Points	Ranking
ASRock AM2V890-VSTA (K8T890 200/800 A64 5000+)	1960
Albatron KM51PV-AM2 (GF6150 200/800 A64 5000+)	1971
MSI K9N SLI Platinum (NF 570 SLI 200/800 A64 5000+)	1936
ECS PN2 SLI2+ (NF 680i SLI 200/800 Core 2 Duo GeForce 7800GTX Single)	2096
ECS PN2 SLI2+ (NF 680i SLI 200/800 Core 2 Duo GeForce 7800GTX SLI)	2073
MSI P6N SLI Platinum (NF 650i 200/800 Core 2 Duo GeForce 7800GTX Single)	2064
MSI P6N SLI Platinum (NF 650i 200/800 Core 2 Duo GeForce 7800GTX SLI)	2086
Asus P5N32-SLI Premium (NF 590 SLI 200/800 Core 2 Duo GeForce 7800GTX Single)	2101
Asus P5N32-SLI Premium (NF 590 SLI 200/800 Core 2 Duo GeForce 7800GTX SLI)	2080
Foxconn 975X7AB-8EKRS2H (975X 200/800 Core 2 Duo)	2099
MSI P965 Platinum (P965 200/800 Core 2 Duo)	2112
ECS PN1 SLI2 Extreme (NF 590 SLI 200/800 Core 2 Duo GeForce 7800GTX Single)	2106
ECS PN1 SLI2 Extreme (NF 590 SLI 200/800 Core 2 Duo GeForce 7800GTX SLI)	2099

Looking at 3DMark06 results now, it's clear SLI improves performance nicely. The CPU score stays about the same even with SLI enabled because as the name indicates, it's a CPU test.