Although we have already reviewed GeForce GTX 590, we haven't yet had a chance to test it in SLI mode. Well, that's what we'll do today. We shall also take a look at factory overclocked GTX 550 Ti and GTX 560 from the same company.

Specifications

Zotac GeForce GTX 590

GPU: GeForce GTX 590 (2 x GF110) Interface: PCIe 2.0 x16 GPU clock rate (ROPs/shaders): 607/1214 MHz (standard) Memory clock rate, physical (effective): 853 (3414) MHz (standard) Memory bus: 2 x 384-bit Stream processors: 2 x 512 Texture units: 2 x 64 (BLF/TLF/ANIS) ROP units: 2 x 48 Dimensions: 279x111x33 mm Board color: black Output connectors: 3 x Dual-Link DVI-I, mini-DisplayPort Multi-GPU mode: hardware SLI

Zotac AMP! GeForce GTX 560

GPU: GeForce GTX 560 (GF114) Interface: PCIe 2.0 x16 GPU clock rate (ROPs/shaders): 950/1900 MHz (the standard is 810/1620 MHz) Memory clock rate, physical (effective): 1100 (4400) MHz (the standard is 1000 (4000) MHz) Memory bus: 256-bit Stream processors: 336 Texture units: 56 (BLF/TLF/ANIS) ROP units: 32 Dimensions: 229x111x35 mm Board color: black Output connectors: 2 x Dual Link DVI-I, mini-HDMI Multi-GPU mode: hardware SLI

Zotac AMP! GeForce GTX 550 Ti

GPU: GeForce GTX 550 Ti (GF116) Interface: PCIe 2.0 x16 GPU clock rate (ROPs/shaders): 1000/2000 MHz (the standard is 900/1800 MHz) Memory clock rate, physical (effective): 1100 (4400) MHz (the standard is 1025 (4100) MHz) Memory bus: 192-bit Stream processors: 192 Texture units: 32 (BLF/TLF/ANIS) ROP units: 24 Dimensions: 188x111x33 mm Board color: black Output connectors: 2 x Dual Link DVI-I, HDMI, DisplayPort Multi-GPU mode: hardware SLI

Design

Comparison with the reference design, front view

Zotac GeForce GTX 590	Reference NVIDIA GeForce GTX 590

Zotac AMP! GeForce GTX 560	Reference NVIDIA GeForce GTX 560 Ti

Zotac AMP! GeForce GTX 550 Ti	Reference NVIDIA GeForce GTX 550 Ti

Comparison with the reference design, rear view

Zotac GeForce GTX 590	Reference NVIDIA GeForce GTX 580

Zotac AMP! GeForce GTX 560	Reference NVIDIA GeForce GTX 560 Ti

Zotac AMP! GeForce GTX 550 Ti	Reference NVIDIA GeForce GTX 550 Ti

While the GTX 590 is a copy of the reference design, the other two, GTX 560 and GTX 550 Ti, are custom products which have shorter PCBs and improved power supply units to support considerable factory overclocking.

Maximum resolutions and frequencies:

• 240 Hz maximum refresh rate
• 2560 x 1600 @ 60Hz max. digital (DVI) resolution
• 2048 x 1536 @ 85Hz max. analog (VGA) resolution

Speaking of supplementary power connectors, the GTX 560 has two 6-pin, the GTX 590 has two 8-pin, and the GTX 550 Ti has one 6-pin connector.

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