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Intel Lynnfield Core i5 750, Core i7 860 and Core i7 870 CPU review: bombarding the mid-range

by Tarinder Sandhu on 8 September 2009, 05:00 4.0

Tags: Core i5 750, Core i7 860, Core i7 870, Intel (NASDAQ:INTC)

Quick Link: HEXUS.net/qatql

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System setup and notes

System Intel Core i5/i7 LGA1156 system Intel Core i7 LGA1366 system Intel Core 2 system AMD Phenom AM3 system
Processors
Intel Core i5 750 (2.66GHz, 1MB L2, 8MB L3, quad-core, £139*
Intel Core i7 920 (2.66GHz, 1MB L2 cache, 8MB L3, quad-core, £190**)
Intel Core 2 Quad Q9650 (3.0GHz, 12MB L2 cache, quad-core, £241.95)
AMD Phenom II X4 965 BE (3.40GHz, 2MB L2, 6MB L3, AM3, quad-core, £160**)
Intel Core i7 860 (2.80GHz, 1MB L2, 8MB L3, quad-core, £190*
Intel Core i7 950 (3.06GHz, 1MB L2 cache, 8MB L3, quad-core, £385**)
Intel Core i7 870 (2.93GHz, 1MB L2, 8MB L3, quad-core, £385 *
Intel Core i7 975 EE (3.33GHz, 1MB L2 cache, 8MB L3, quad-core, £699**)
Motherboard
ASUS Maximus III Formula (P55 + ICH10R)
Foxconn Bloodrage X58 (X58+ICH10R)
Foxconn P45A-S  (P45 + ICH10R)
ASUS M4A79T Deluxe (790FX + SB750)
BIOS revision
0603 (25/08/09)
P08 (13/04/09)
P05 (27/08/08)
1604 (21/08/09)
Memory
4GB (2 x 2GB) Corsair DOMINATOR CMD8GX3M4A1600C8
6GB (3 x 2GB) Corsair Dominator TR3X6G1600C8D
4GB (2 x 2GB) Corsair DOMINATOR 8500 DDR2
4GB (2 x 2GB) Corsair DOMINATOR CMD8GX3M4A1600C8
Memory timings and speed
8-8-8-24-1T @ 1,604.4MHz 
8-8-8-24-2T @ 1,604.4MHz (860/870)   (1,337MHz for 750)
5-5-5-15-2T @ 1,066.6MHz 
8-8-8-24-1T @ 1,337.6MHz 
Graphics card
Sapphire Radeon HD 4890 XT 1,024MB
Hard disk drive
Seagate 1000GB SATAII (ST31000528AS)
Optical drive
Samsung SH-D163 SATA DVD-ROM
Motherboard software
Intel Inf 9.1.1.1015 + Matrix Storage Manager 8.9.0.1023
Intel Inf 9.1.0.1012 + Matrix Storage Manager 8.7.0.1007
Intel Inf 9.1.0.1008
Standard Vista SP1 drivers + AHCI 3.1.1540
Graphics driver
ATI Catalyst 9.8
Operating system
Windows 7 RTM Ultimate, 64-bit
Power supply
Corsair HX1000W
Monitor
Dell 2405FPW/Dell 3007WFP-HC
*pricing guesstimated for LGA1156 chips
** reflects revised pricing which should come into play later on today

Software

Benchmarks ScienceMark memory latency 
Sandra 2009 SP4 (15.124), float buffered
HEXUS.PiFast calculation to 10m places
StaxRip X.264 + AAC encoder - two-pass (both passes recorded)
CINEBENCH R10 multi-CPU render 64-bit
POV-Ray 3.7.0 beta 34 64-bit

Far Cry 2, v1.03, DX10, 1,024x768 medium and 1,680x1,050 high quality
ET: QW, v1.5, OpenGL, 1,024x768 low and 1,680x1,050 - high quality

StaxRip X.264 + AAC encoder - two-pass and QuickTime 7.6.2 (multitasking)
StaxRip X.264 + AAC encoder - two-pass and ET: QW, v1.5, 1,680x1,050 (multitasking)

Power-draw at idle and 2D load, as a platform

Notes

A few important updates since our last round of CPU benchmarking. The operating system is now Windows 7 RTM Ultimate 64-bit, necessitating benchmarking from scratch.

Intel provided HEXUS with two engineering-sample CPUs, Core i5 750 and Core i7 870, and both CPUs' results have been included. The reported numbers are for the chips running Turbo Boost speeds, as highlighted on page four. However, manually downclocking the engineering-sample '870 to an 860's speed - 2.80GHz - on the ASUS Maximus III Formula could only be achieved at the expense of negating Turbo Boost. Setting a 21x multiplier removed the Turbo option, so any numbers we report will not be wholly accurate when compared to a retail chip. We will update the review with a retail 860's performance as soon as is practical.

Our testing with the Core i7 870 highlighted a problem with Turbo Boost, insofar as the chip would clock up to 3.46GHz when under single-core load, not 3.60GHz, as expected. As such, the single-threaded results will be a little lower than what would otherwise be the case.

The Intel pricing has been taken from a revised list that was published here. We expect AMD to retaliate by dropping Phenom II X4 965 BE's price to around £160.

The interesting price-to-price comparisons will be Core i7 860 vs. Core i7 920 vs. Phenom II X4 965 BE. Bear in mind that the (emulated) engineering-sample 860's Turbo Boost feature is disabled by the board.