Buy the ARP T-Shirt! BIOS Optimization Guide Money Savers!
 
 08 November 2008
 N/A
  N/A
 Editorials
 Dr. Adrian Wong
 1.0
 Discuss here !
 26372
 
   
Hard Disk Drive Myths Debunked Rev. 5.4
This guide was written in response to the numerous fallacies about the hard disk driv... Read here
BIOS Option Of The Week - Host Burn-in Mode
Since 1999, we have been developing the BIOS Optimization Guide, affectionately known... Read here
   
Buy The BOG Book Subscribe To The BOG! Latest Money Savers!
ED#104 : Intel Reveals More Details On The Core i7 Processors
Digg! Reddit!Add to Reddit | Bookmark this article:

Overclockability

They tested the overclockability of the Core i7-965 Extreme Edition and were able to achieve a maximum stable clock speed of 3.9 GHz at stock voltage, using only the stock cooler. That's an overclock of about 22 % over the stock clock speed of 3.2 GHz. The CPU temperature was quoted as 44 °C but the test system used a high-airflow case to achieve that low temperature.

 

DDR3 Memory Voltage

Intel confirmed the 1.65 V limit on memory voltage. According to Intel, the Core i7's memory controller is rated to support a voltage of 1.5 V but they allow voltages of up to 1.65 V for those who intend to overclock. However, that is the absolute limit. Going above that will very likely "fry" the memory controller and turn that expensive processor into a piece of useless paperweight.

Intel recommends that you do not overclock the DDR3 memory modules. The Core i7's triple memory channels, on-die memory controller and multi-level caches deliver such high memory bandwidth that there is very little performance benefit from using even higher-speed memory modules. To prove the point, they ran the test systems using only DDR3-1066 modules. See below for the performance results.

 

Cache & Memory Performance

Intel showed us a testbed running the Core i7-965 Extreme Edition processor with DDR3-1066 memory running on timings of 9-9-9-24. Here are the cache and memory bandwidth results :

Cache / Memory

Latency

Read Speed

Write Speed

Copy Speed

L1 Cache

1.2 ns

51,190 MB/s

51,174 MB/s

102,302 MB/s

L2 Cache

3.3 ns

34,108 MB/s

30,784 MB/s

39,624 MB/s

L3 Cache

4.5 ns

23,757 MB/s

17,458 MB/s

23,816 MB/s

DDR3 Memory

47 ns

12,145 MB/s

11,878 MB/s

15,976 MB/s

As you can see, the Core i7's triple DDR3 memory channels delivered about 12 GB/s of bandwidth even using just DDR3-1066 memory modules. We will have more details on the caches in an upcoming tech report.

Page

Topics

1

Introduction
Intel Turbo Mode Technology

2

Overclockability
DDR3 Memory Voltage
Cache & Memory Performance

3

PSU Requirements
King Of 3DMark Vantage
Not Quite The End

 

Support Tech ARP!

If you like our work, you can help support out work by visiting our sponsors, participate in the Tech ARP Forums, or even donate to our fund. Any help you can render is greatly appreciated!



 
   
Western Digital Caviar Green (WD30EZRX) 3 TB Desktop Hard Disk Drive Review
Intel Core i7-975 Extreme Edition Processor Review
Manfrotto 190PROB (Bogen 3001BPRO) Professional Tripod Review
OCZ PC2-6400 Platinum Bandwidth Enhanced DDR2 Memory Overview
O2 Xphone Smartphone Review
Maxxing Out The GeForce Fx Go5200
Toshiba Satellite M30 Notebook Review
North Bridge Wet-Sanding Guide
Definitive Review of the Cooler Master ASC-V73 Aero 7
Definitive Review of the Bose QuietComfort Acoustic Noise Cancelling Headset

 


Copyright © Tech ARP.com. All rights reserved.