A good deal?? Newegg: OCZ DDR2-1150 - Page 3 - Overclock.net

Infinitegrim · 03-29-09

Quote:

Originally Posted by Slink

That would be good information if you could supply the overall CPU frequency. Without that information, I'm not sure how to interpret the timings you gave. Thanks, tho! Got CPU speeds for me?

I wont be able to get that until monday after noon

Ok i just remember them.

667Mhz 3-3-3-9 2.1v FSB: 333 Ratio 1:1 multi: 9.5x 3.16Ghz
1000Mhz 4-4-4-12 2.1v FSB: 500 Ratio 1:1 i varied the multi
............................also FSB: 400 Ratio: 4:5 again varied the multi
1190Mhz 5-5-5-15 2.1v FSB: 496 Ratio 5:6 i varied the multi

Sullivan · 03-29-09

Quote:

Originally Posted by Slink

I was trying to get super tight timings at DDR2-800 with it, but I couldn't seem to get it right. I don't know enough about RAM timings. Volted it to 2.3v and it stayed pretty cool tho. Back down to 2.2v now, running at 800-5-5-5-15, unfortunately... any help?

My mobo can't go past 800 until a bios upgrade. :-P

Would you rather have DDR2-800? Ill trade you for mine.

Slink · 03-30-09

Quote:

Originally Posted by Sullivan

Would you rather have DDR2-800? Ill trade you for mine.

Quote:

Originally Posted by Infinitegrim

I wont be able to get that until monday after noon

Ok i just remember them.

667Mhz 3-3-3-9 2.1v FSB: 333 Ratio 1:1 multi: 9.5x 3.16Ghz
1000Mhz 4-4-4-12 2.1v FSB: 500 Ratio 1:1 i varied the multi
............................also FSB: 400 Ratio: 4:5 again varied the multi
1190Mhz 5-5-5-15 2.1v FSB: 496 Ratio 5:6 i varied the multi

Thanks, homie. How the bloody heck to people (e.g.: you) get such tight timings on such wicked CPU + RAM speeds?? I don't get it... Was your CPU freq definitely above 3.00 Gigs for that 1000MHz RAM speed?

Cryptedvick · 03-30-09

Quote:

Originally Posted by rootkit

为什么每次都看不到自己的头像呢?晕~

yees i see
hmm i understand ...

Infinitegrim · 03-30-09

Quote:

Originally Posted by Slink

<sarcasm>Ha ha ha</sarcasm>

Thanks, homie. How the bloody heck to people (e.g.: you) get such tight timings on such wicked CPU + RAM speeds?? I don't get it... Was your CPU freq definitely above 3.00 Gigs for that 1000MHz RAM speed?

No, it was above 4 gigs

But think of it, i have it running 150Mhz slower then stock,
and only shaved off 1-1-1-3 from the timings

Here is a quick benchmark showing the bandwidth of these at 1170Mhz

Slink · 03-31-09

Well, yeah you can run RAM at a slower base "speed" (freq, ex: ddr2-667) and turn timings all the way down. But there's not much performance gain from that, if you can get any at all. It's about finding a happy medium between FSB, RAM speed, & RAM timing. This "happy medium" is actually more of a "happy high", where we try to optimize the RAM to fire as fast as it can.

If you use simple math to determine the outcome, we see the following "magic numbers":

Code:

1066 @ 6 gives 1066/6 = ~178
1066 @ 5 gives 1066/5 = ~213 (667@3 still beats this, but this setting is still pretty fast)
1066 @ 4 gives 1066/4 = ~266 (this isn't even an option for me, but running 1066@4 would yield
			      the highest realistically achievable magic number, thus fastest of
			      all these, therefore most likely to be unstable.)
1066 @ 3 WOULD give 1066/3 = 355, but that is NOT GOING TO HAPPEN.)
800 @ 5 gives 800/5 = 160 (slowest)
800 @ 4 gives 800/4 = 200 (higher number is better).
667 @ 3 gives 667/3 = ~222 (so you WOULD probably get a performance gain from 667@3-3-3-8, etc.)
667 @ 4 gives 667/4 = ~167 (slower)

There is a number where the RAM becomes unstable at any higher number. For example, my old ram was pretty lame at DDR2_920@5-5-5-18, and that = 920/5 = ~184. That was the limit number of my old RAM. Pretty bunk. Now I have to find the limit number of my new RAM...
See how much of a difference exists between timings "3" and "4"? 667 @ 3 should theoretically be faster than 800 at 4. Hmm, I seem to have proven you right, but only if you can manage to achieve omnipresent super-galactic oneness! (By which I mean stable setting of DDR2-667 @ 3-3-3-8).
Granted, this is just a rough estimation, but the general idea is that a period of 3 clock cycles happens more times in 667 cycles, than a period of 4 cycles happens in a period of 800 cycles. Granted, these are in "cycles-per-second" (800 megahertz, 667 MHz).
Note that the default speeds (667, 800, 1066) are only achievable with a FSB (iow, HTT, or "reference") freq. of 200 MHz. As you increase that freq, you increase the RAM freq, therefore increasing the "magic number".

What do you think?
-Slink

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A good deal?? Newegg: OCZ DDR2-1150

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