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i920 Multiplier

R

Rucker61

Limp Gawd
Joined
May 14, 2009
Messages
264
I'm in the middle of my i920 build with everything still on the test station. I have turbo on for the dummy OC, running about about 3.3 GHz (21 x 160). However, in EVGA's eleet utility, core 0 shows up with a 22 multiplier. I have no idea what this means. Any help?

Glenn D.
 
Not all utilities accurately report the multiplier on Core i7 CPUs. As a matter of fact, very few do.

When lightly loaded, depending on bios settings like C-states, it is possible for a Core i7 - 920 to use a 22X multiplier. This is only possible when 1 core is active. That means you either have to disable 3 cores in the bios, which kind of defeats the purpose or enable C-States and hope that your motherboard properly supports this feature. On the Intel board, if you are running a single threaded app, it is possible to get a 22X multiplier even when overclocking. It is one of the few boards that supports this feature correctly.

The default multiplier is 20X and you can have either a +1 or a +2 turbo boost. Some boards will rapidly cycle between 21X and 22X and some boards only work correctly when you are not overclocking at all.

I wrote a program called i7 Turbo V8 which can monitor the multiplier on each thread in real time. It uses the Intel recommended method to read what multiplier your CPU is running at as outlined in the November 2008 Intel Turbo White Paper. Other than RealTemp, no other monitoring software seems to be using this method. i7 Turbo is now included in the RealTemp download.

http://www.fileden.com/files/2008/3/3/1794507/RealTempBeta.zip

Give it a try and post some results. ELEET and CPU-Z will sometimes show a 22X multiplier at idle which is usually not correct.

Here's the [H]ard thread about i7 Turbo.
http://www.hardforum.com/showthread.php?t=1417780

It's a handy program for testing so give that thread a bump so other users can find it.
I recommend not using HW Monitor, Everest or RealTemp 3.00 or any program that monitors motherboard voltages when testing. This used to cause some interference in i7 Turbo's results.
 
Thanks for the response. I'll look at your program tonight.

System: Win 7 7100; i920; EVGA x58 SLI; EVGA GTX 275; OCZ Platinum 3 x 2GB RAM; Corsair 850TX PSU; Cooler Master HAF 922.
 
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