Performing overclocking the GTX 590 can only be described as a big pain in the ass. I've never seen a more crash-happy card than this when doing overclocking. Basically my "find maximum overclock" consisted of setting a clock speed, running a benchmark for 10 seconds and then waiting 45 seconds until the system finished rebooting after a system hang. If you plan to do overclocking, please make a system image backup, so you can recover quickly in case the constant system crashes break something.
Today NVIDIA releases their new GeForce GTX 590 flagship which is based on two GTX 580 GPUs working on a single card. AMD released their dual-GPU HD 6990 design just two weeks ago, with power and heat being the decisive limit on performance it will be a tough fight between those cards.
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