IPC is never static across the range of workloads, so those who used the Trinity results as a sign that 15% is a representation of average increases, should realize that was never going to be realistic. If the Cinebench R11.5 bench is correct, you're looking at an IPC increase shy of 10% (mid-high 9s) in CB.
Using an extremely crude estimate, based on the CB results, would see the FX-8 series look somewhat like this in CB Multithread.
FX 8300 score @ 3.3GHz = 5.73 —replaces— FX 8100 score @ 2.8GHz = 4.62
FX 8320 score @ 3.5GHz = 6.08 —replaces— FX 8120 score @ 3.1GHz = 5.04
FX 8350 score @ 4.0GHz = 6.95 —replaces— FX 8150 score @ 3.6GHz = 6.01
Those numbers are not in any way exact (including the Zambezi scores) and should only be seen as very rough estimates. Other similarly crude Vishera estimates, see the FX-8350 somewhere in the range of 7.22 or so in CB Multithread.
While different configurations and testing methods can not be directly compared, here are some CB results from different sites.
http://www.hardwarecanucks.com/forum/hardware-canucks-reviews/53054-intel-i7-3770k-ivy-bridge-cpu-review-11.htmlWarning: Spoiler! (Click to show)
AMD Eng Sample, ZD338251W8K54_39/33/22_2/8Asus M5A97 EVO R2.0 M5A97 EVO R2.0 User's Manual - Page 91
— http://www.manualowl.com/m/Asus/M5A97-EVO-R2.0/Manual/295316?page=91Warning: Spoiler! (Click to show)
Memory Performance Gains On The Crosshair V Formula-Z & Sabertooth 990FX R2.0
3.5.1 The items in this menu show the CPU-related information that the BIOS automatically detects. The items shown in this screen may be different due to the CPU you installed. UEFI BIOS Utility - Advanced Mode CPU Configuration Exit Main Back Ai Tweaker Advanced\ CPU Configuration > Advanced Monitor Boot Tool CPU Configuration
Socket 942: AMD Eng Sample, ZD338251W8K54_39/33/22_2/8 8 Cores Running @3300 MHz 1375 mV Max Speed: 3300 MHz Intended Speed: 3300 MHz Not loaded Cache per Core L1 Instruction Cache: 64 KB/2-way L1 Data Cache: 16 KB/4-way L2 Cache: 2048 KB/16-way Total L3 Cache per Socket: 8 MB/64-way
AMD Engineering Sample, ZD358246W6K54_41/35/20_2/8 (ES)
- FX-6300 3.5GHz base/4.1GHz turbo, 95WWarning: Spoiler! (Click to show)
- FX-6100 3.3GHz base/3.9GHz turbo, 95W
- FX-6200 3.8GHz base/4.1GHz turbo, 125W