CalcProgrammer1
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nVidia has SLI but you have to make sure your motherboard is compatible. Intel's chipsets usually support both CrossFire and SLI, but AMD's chipsets are CrossFire only. To run SLI on an AMD processor you need a motherboard with an nVidia chipset (these are SLI only, they do not have CrossFire support).
As far as the HD5830 goes, Cypress is the high-end ATi chipset used in the 58xx cards. It is the processor behind the 5830, 5850, and 5870 as well as the 5970 (which has 2 Cypress chips). The Juniper is the next highest which powers the 57xx cards. Most manufacturers make chipsets for product lines and not individual products because of quality control issues in the manufacturing process. If only 70% of the Cypress chips that come off the manufacturing line have all 1600 shader processors working, normally they would have to discard the other 30%. However, they have devised lower product line models to use these "defective" chips. They simply use a hardware mask to disable the defective shaders and sell it as a lower model. This means that a 5830 has the exact same chip that the 5870 has only with some parts disabled. In some cases you may be able to "unlock" these extra units with a BIOS modification or other hack and make your 5830 into a 5870. To be fair, this also applies to nVidia GPU's as they do much the same thing with their product lines.
As far as the HD5830 goes, Cypress is the high-end ATi chipset used in the 58xx cards. It is the processor behind the 5830, 5850, and 5870 as well as the 5970 (which has 2 Cypress chips). The Juniper is the next highest which powers the 57xx cards. Most manufacturers make chipsets for product lines and not individual products because of quality control issues in the manufacturing process. If only 70% of the Cypress chips that come off the manufacturing line have all 1600 shader processors working, normally they would have to discard the other 30%. However, they have devised lower product line models to use these "defective" chips. They simply use a hardware mask to disable the defective shaders and sell it as a lower model. This means that a 5830 has the exact same chip that the 5870 has only with some parts disabled. In some cases you may be able to "unlock" these extra units with a BIOS modification or other hack and make your 5830 into a 5870. To be fair, this also applies to nVidia GPU's as they do much the same thing with their product lines.