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i7-920: 1333 vs 1600 ram

post #1 of 14
11/20/08 at 7:25pm
Thread Starter 
I am picking between the two speed of rams. I plan to OC 920 over 4.0ghz if possible will 1333mhz with 8x multiplier bottleneck my cpu? (200FSB x20 =4000mhz cpu; 200FSB x 8 = 1600mhz ram, 263mhz overclock from 1333mhz)
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post #2 of 14
11/20/08 at 8:07pm
Depends on the price. I have dual core at that speed with DDR2 ram at 1008mhz and my computer very fast. So I think jumping up to those speeds in triple channel... well either will suffice. If the price is less then 35 or 50 dollars I would say it is worth it, otherwise cheaper is better.

BTW, any RAM will do to get that overclock, since i7 has a huge multiplier.
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post #3 of 14
11/20/08 at 8:36pm
Thread Starter 
I am not getting how this works. From what I heard, 920 has locked multiplier, the only way to OC it is through BCLK (defualt 133mhz x 20). There are only two multipliers for RAM: 8x or 6x. At bclk of 200mhz (4.0ghz cpu clock), ram will be running 1600mhz when 8x, 1200mhz in 6x (underclock). I am not a big fan of underclocking but at the same time I don't know if the memory can OC that far.
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post #4 of 14
11/20/08 at 9:25pm
I think its best to get PC3 8500 and clock up from there.
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post #5 of 14
11/20/08 at 9:39pm
Quote:
Originally Posted by BizzareRide View Post
I think its best to get PC3 8500 and clock up from there.
good luck with overclocking ddr3 triple channel with only 1.65 volts available..

get the 1600mhz stuff.
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post #6 of 14
11/20/08 at 9:53pm
Quote:
Originally Posted by iggster View Post
good luck with overclocking ddr3 triple channel with only 1.65 volts available..

get the 1600mhz stuff.
I second that. Better to have more headroom than a dead CPU.
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post #7 of 14
11/20/08 at 10:17pm
Quote:
Originally Posted by DaCrusader View Post
I second that. Better to have more headroom than a dead CPU.
Your right now that I think about it, go with PC3 12800. This is what I was trying to convey about headroom earlier but I got things mixed up
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post #8 of 14
11/21/08 at 3:14am
Quote:
Originally Posted by BizzareRide View Post
Your right now that I think about it, go with PC3 12800. This is what I was trying to convey about headroom earlier but I got things mixed up
You are not wrong, just misinformed.

There are many tricks which can be used to get the 1066mhz module memory up to 1200, 1333 or 1600mhz.

First lets take the Crucial module number CT3KIT12864BA1067 which can be found right here for £83,41.

The specifications:

# Module Size: 3GB kit (1GBx3)
# Package: 240-pin DIMM
# Feature: DDR3 PC3-8500
# Specs: DDR3 PC3-8500 • CL=7 • Unbuffered • NON-ECC • DDR3-1066 • 1.5V • 128Meg x 64 •

Now lets think about things.

There are 2 ways to get the speed of 1600mhz.

First: increase the latency to 9.
Second: increase the memory voltage to 1.64 and latency to 8.

At the end you will not be spending much for such speed and could save some money to get good cheap 6X2GB DDR3 modules when the price goes down by next year altogether with Windows 7 if that is the case.
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post #9 of 14
11/21/08 at 6:31am
No, 1333 is not going to bottleneck you. Tests have shown that the real-world difference between 1333 and 1600 on an i7 is small, certainly not worth the price IMHO. It probably won't matter to anyone except those who really want to suqeeze every last drop out of the system.

See this article for the details, it's what convinced me that 1333 would be just fine:

http://www.overclock.net/hardware-ne...st-memory.html
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post #10 of 14
11/21/08 at 7:41am
I've also read that you actually get better bandwidth performance with DDR1333 because the memory controller only runs in dual channel mode with DDR1600 memory.
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