Bloomfield (microprocessor)
Intel Core i7 Logo used on Core i7-920, 940 and 965, which is based on Bloomfield.
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| Produced | From November 2008 to January 2011 |
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| Designed by | Intel |
| Max. CPU clock rate | 2.66 GHz to 3.33 GHz |
| Min. feature size | 45 nm |
| Instruction set | x86, x86-64, MMX, SSE, SSE2, SSE3, SSSE3, SSE4.1, SSE4.2 |
| Microarchitecture | Nehalem |
| CPUID code | 106Ax |
| Product code | 80601 |
| Cores | 4 |
| L2 cache | 4× 256 kB |
| L3 cache | 8 MB |
| Socket(s) | |
| Application | Desktop |
| Brand name(s) | |
Bloomfield is the code name for Intel high-end desktop processors sold as Core i7-9xx and single-processor servers sold as Xeon 35xx., in almost identical configurations, replacing the earlier Yorkfield processors. The Bloomfield core is closely related to the dual-processor Gainestown, which has the same CPUID value of 0106Ax (family 6, model 26) and which uses the same socket. Bloomfield uses a different socket than the later Lynnfield and Clarksfield processors based on the same 45 nm Nehalem microarchitecture, even though some of these share the same Intel Core i7 brand.
Bloomfield has many new features that represent significant changes from Yorkfield:
The process of overclocking the Bloomfield architecture is similar to that of the AMD architecture due to the on-die MCH. Over-clocking will be possible with the 900 series and a motherboard equipped with the X58 chipset. In early October 2008, reports surfaced that it will not be possible to use "performance" DDR3 DIMMs that require voltages higher than 1.65v, because the integrated memory controller within the Core i7 will be damaged.
Bloomfield has three memory channels, and the channel bandwidth can be selected by setting the memory multiplier. However, in early benchmarks, when the clock rate is set higher than a threshold (1333 for the 965XE) the processor will only access two memory channels simultaneously. A 965XE has higher memory throughput with 3xDDR3-1333 than with 3xDDR3-1600, and 2xDDR3-1600 has almost identical throughput to 3xDDR3-1333.
The Core i7 Bloomfield does not support error-correcting memory. Some motherboards with an LGA 1366 socket support both Core i7 and the Xeon 35xx and 55xx series processors, and advertise support for ECC memory. However ECC functionality is only available if a Xeon is installed, not if a Core i7 is installed.
The Core i7 950 and the Core i7 975 Extreme Edition were introduced in March 2009 with prices similar to the prices for the 940 and 965 Extreme Edition, respectively, but with better performance in each case. Intel has scheduled the discontinuation of the 940 and 965XE for Q3 2009. Intel announced discontinuations in other older families at the same time.
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