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Well, here's a bright spot (other than the GPU) for Ivy Bridge: the i5 3570(k) shows a big speed-up in math operations compared to the 2500k, and is almost equal to the 3770k for math.

From the charts here:
http://www.guru3d.com/article/core-i7-3770k-and-3750-review-with-z77/15
http://www.guru3d.com/article/core-i7-3770k-and-3750-review-with-z77/16

For stock versions, the 3570(k) is faster than the 2500k by these amounts:
SiSoftware Sandra Dhrystone ALU: 51%
SiSoftware Sandra Whetstone FPU: 98%
Queens CPU: 50%

Page 5 of the same article mentions improvements to the AVX, which may explain the big FPU speedup:
"Intel opened up the data path which has been expanded from 128 bits to 256 bits, the two-operand instruction limit is increased to three operands..."

I know most apps don't see much speed bump from math improvements, but for those needing lower $ workstations to run FEA, CFD, etc (like me), this chip is looking great. And there's now little reason to pay for a 2600k or 3770k, since the solvers are usually well-optimized for multi-cores. (For 2 FEA programs I use on an i7 920, hyperthreading is actually ~2% slower!)
Workstation
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CPUMotherboardGraphicsRAM
i7 920, 4.0GHz, 1.21V Asus P6X58D Premium EVGA 9500 GT G Skill 12GB  
Hard DriveHard DriveCoolingOS
WD Patriot Pyro SE 60GB Xigmatek SD1283 DK Win 7 64 bit 
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Antec 300 
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Workstation
(9 items)
 
  
CPUMotherboardGraphicsRAM
i7 920, 4.0GHz, 1.21V Asus P6X58D Premium EVGA 9500 GT G Skill 12GB  
Hard DriveHard DriveCoolingOS
WD Patriot Pyro SE 60GB Xigmatek SD1283 DK Win 7 64 bit 
Case
Antec 300 
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Reply