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Review: Intel Conroe Core 2 Duo/Extreme Processors

by Tarinder Sandhu on 14 July 2006, 05:00

Tags: Intel (NASDAQ:INTC)

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System setup and notes

System Intel LGA775 system AMD AM2 system
Processor Intel Core 2 Duo X6800 (2.93GHz, 4MiB L2 cache, LGA775)
Intel Core 2 Duo E6700 (2.67GHz, 4MiB L2 cache, LGA775)
Intel Core 2 Duo E6600 (2.40GHz, 4MiB L2 cache, LGA775)
Intel Core 2 Duo E6400 (2.13GHz, 2MiB L2 cache, LGA775)
Intel Pentium Extreme Edition 965 (3.73GHz, 4MiB L2 cache, LGA775)
AMD Athlon 64 FX-62 (2.8GHz, 2MiB L2 cache, AM2)
AMD Athlon 64 X2 4600+ (2.4GHz, 1MiB L2 cache, AM2)
Motherboard Intel D975XBX Bad Axe rev. 304 ATI Sturgeon Reference
Memory 2GiB (2 x 1024) Corsair PC8500
Memory timings and speed 4-4-4-12 2T @ 800MHz (PC6400)
Graphics card(s) Sapphire Radeon X1900 XTX 512MiB
Disk drive(s) Maxtor 300GB SATA (6V300FO) Seagate 160GB 7200.9 SATA 3Gbps
BIOS revision 1304 (20/06/06) 08.00.13 (04/05/06)
Mainboard software Intel Inf Update CATALYST 6.6 Southbridge package and SATA(AHCI): 2.5.1540.25
Graphics driver CATALYST 6.6 BETA
Operating System Windows XP Pro SP2 32-bit

Testing software

We ran the processors through our usual array of benchmarks


  • ScienceMark Memory Bandwidth
  • ScienceMark Memory Latency
  • HEXUS Pifast calculation to 10M places
  • HEXUS Cryptography
  • Realstorm Raytracing 2004
  • KribiBench v1.1
  • HEXUS WAV encoding
  • HEXUS DivX encoding
  • Cinebench 2003 v9.5


  • Far Cry v1.33
  • Quake 4 v1.04
  • Splinter Cell: Chaos Theory
  • Futuremark 3DMark05 b1.2.0


See, we do have 'em. Conroe and Allendale at your service.

We had no problems in running the Core 2-based CPUs in an Intel D975XBX 'Bad Axe' rev. 304 motherboard. Motherboard vendors are now adding Core 2 Duo support to their line of i975X boards. We're adamant that all the top tier guys have compliant boards. However, should you wish to jump on the 965-Express bandwagon, that's fine too.

Rather than give you all the treats at once, we'll wait a couple of days before showing you Core 2 Extreme X6800 performance on i975X vs P965.

We've added in all but one Core 2 Duo processor in our line-up here, and we've compared performance to the fastest Presler CPU around, the Pentium Extreme Edition 965. Further, we've added in benchmark results from AMD's Athlon 64 FX-62 and 4600+ CPUs, both run on a reference ATI Sturgeon AM2-supporting motherboard. This way, we feel, you'll better appreciate where each Core 2 Duo processor lies in relation to the competition.

On a heat-related note, using a reference LGA775 heatsink the Core 2 Extreme X6800 idled at 53C in BIOS and the 2MiB cache-equipped E6400 at 44C. Windows load temperatures were similar to these figures. Bear in mind that ambient temperature was 27C and no extra cooling, other than CPU fan, was directed towards the CPUs.

We'll be taking a look at overclocking a retail, off-the-shelf Core 2 Duo next week, rather than offer numbers from engineering samples, so stay tuned for that.

Anyway, on to the benchmarks.