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Question for the pros

S

Samhorns

n00b
Joined
Nov 25, 2005
Messages
30
Can I run my proc at a different speed then my ram these days? The mobo supports 1066/1333 for procs but only 1066 for ram, the proc is a 1333 and the ram is 1066. Am I going to have to downclock my proc to ram speeds or OC the ram to proc speeds to make this work? I'd like to run each at their respective speeds but do not know if that is possible. I figured I would ask those who will be more then happy to school my butt if needed

The combo I'm putting together all from Newegg:

ASUS P5K-E/WIFI-AP LGA 775 Intel P35 ATX Intel Motherboard - Retail
Item #: N82E16813131196

Intel Core 2 Duo E6750 Conroe 2.66GHz LGA 775 Processor Model BX80557E6750 - Retail
Item #: N82E16819115029

CORSAIR Dominator 2GB (2 x 1GB) 240-Pin DDR2 SDRAM DDR2 1066 (PC2 8500) Dual Channel Kit Desktop Memory Model TWIN2X2048-8500C5D - Retail
Item #: N82E16820145043

The mobo clearly states memory at 1066 but the FSB can do either 1066 or 1333. I went with the 1333 core hoping this would not either force me to OC the ram or downtune the proc. Am I an old washed up hack or did I figure out a safe combo?

**dawns asbestos underroos**
 
1066 bus speed and 1333 are sort of misleading in a sense for this reason. The bus speed is double because it's double data rate.
Meaning:
533 x 2 bus speed = 1066 FSB and 667 x2 = 1333 FSB

So DDR 667 RAM is all that is needed for a FSB of 1333. I am somewhat new to overclocking, but this is what I understand of it thus far. If you wanted to take full advantage of DDR 800, you would need to crank your FSB speed up to 1600 mhz. You would only need DDR 1066 if you plan on clocking your board over 2 ghz FSB. If you don't plan on clocking it this fast, then buying DDR 1066 would be a waste of your well earned cash.

Can anyone else with higher OC experience verify that I am explaining this right?
 
Here's a little more indepth for you if you are better off reading figures.

(CPU Multiplier) x [Base FSB speed] = CPU Clock speed
2 x [Base FSB speed] = RAM speed
4 x [Base FSB speed] = Effective FSB speed

Q6600: 9 × 266 = 2.4Ghz, DDR2-533 << STOCK speeds
Q6600: 9 × 333 = 3.0Ghz, DDR2-667 << Nice OC
Q6600: 9 × 378 = 3.4Ghz, DDR2-756 << Good OC, near max on good air for B3 stepping
Q6600: 9 × 400 = 3.6Ghz, DDR2-800 << Great OC, near max on good air for G0 stepping
 
Samhorns said:
Intel Core 2 Duo E6750 Conroe 2.66GHz LGA 775 Processor Model BX80557E6750 - Retail
Item #: N82E16819115029
Click to expand...

Also, since you plan on overclocking anyways... save your self some money and get teh 2.4 ghz Core 2. Or fork over a little more and step up to the Q6600.

Just my last bit of 2 cents.
 
Samhorns said:
Intel Core 2 Duo E6750 Conroe 2.66GHz LGA 775 Processor Model BX80557E6750 - Retail
Item #: N82E16819115029
Click to expand...

Also, since you plan on overclocking anyways... save your self some money and get the 2.4 ghz Core 2. Or fork over a little more and step up to the Q6600.

Just my last bit of 2 cents.

**EDIT SORRY FOR THE DOUBLE POST**
 
Actually I did not plan on OCing as this machine is for someone else and I just want it bulletproof. As I understand the info I have been given I am either going to have to push the ram above it's rated 1066 (or 533 FSB) to 1333 (667 FSB) to match the processor, or run the proc at 2.4. Main reason I bought the 2.66/1333 is it was selling for 35 less then the 2.4/1066 chip. hindsight I probably wouldn't change how I ordered since I was working with someone else's budget, least I got a chip that I know will last even longer at 2.4 I guess.
 
Yah if you can pick that chip up for less do it. But you should be just fine buying some DDR 667. That will work fine... the person that you are building it for will appreciate the cost too!!
 
Samhorns said:
Actually I did not plan on OCing as this machine is for someone else and I just want it bulletproof. As I understand the info I have been given I am either going to have to push the ram above it's rated 1066 (or 533 FSB) to 1333 (667 FSB) to match the processor, or run the proc at 2.4. Main reason I bought the 2.66/1333 is it was selling for 35 less then the 2.4/1066 chip. hindsight I probably wouldn't change how I ordered since I was working with someone else's budget, least I got a chip that I know will last even longer at 2.4 I guess.
Click to expand...

I have a 1333 cpu and DDR2 800 ram (PC6400). Both run as they should. The mobo automatically uses a divider so my ram runs at 800 while my cpu fsb is at 1333.
 
Cmustang87 said:
Here's a little more indepth for you if you are better off reading figures.

(CPU Multiplier) x [Base FSB speed] = CPU Clock speed
2 x [Base FSB speed] = RAM speed
4 x [Base FSB speed] = Effective FSB speed

Q6600: 9 × 266 = 2.4Ghz, DDR2-533 << STOCK speeds
Q6600: 9 × 333 = 3.0Ghz, DDR2-667 << Nice OC
Q6600: 9 × 378 = 3.4Ghz, DDR2-756 << Good OC, near max on good air for B3 stepping
Q6600: 9 × 400 = 3.6Ghz, DDR2-800 << Great OC, near max on good air for G0 stepping
Click to expand...

Jee, that looks familiar!?!? :eek: quote me next time plz ;) and use the right calculations for the CPU he chose, lol.

Samhorns said:
Actually I did not plan on OCing as this machine is for someone else and I just want it bulletproof. As I understand the info I have been given I am either going to have to push the ram above it's rated 1066 (or 533 FSB) to 1333 (667 FSB) to match the processor, or run the proc at 2.4. Main reason I bought the 2.66/1333 is it was selling for 35 less then the 2.4/1066 chip. hindsight I probably wouldn't change how I ordered since I was working with someone else's budget, least I got a chip that I know will last even longer at 2.4 I guess.
Click to expand...

While the board will set the ratio for you, Intel platforms don't benefit at all when run higher than 1:1. With a 1333FSB QDR and 1066Mhz DDR2 RAM, the board should set the ratio to 1:1.6 if its available. You could have saved a TON of money by going with DDR2-667 or DDR2-800 instead, since thats the stock speed for the CPU you chose. Again, Intel platforms don't benefit much, if at all, when run higher than a 1:1 ratio:

E6750: 8 × 333 = 2.6Ghz, DDR2-667 << STOCK speeds
E6750: 8 × 400 = 3.2Ghz, DDR2-800 << Easy OC
E6750: 8 × 450 = 3.6Ghz, DDR2-900 << Good OC
E6750: 8 × 500 = 4.0Ghz, DDR2-1000 << Great OC

Oh, and Dominators are a big waste of money... just for future reference.

2GB DDR2-1066 Dominators: $141AR
2GB DDR2-800 Ballistix: $62AR

Oh, and the Ballistix can easily reach DDR2-1066 speeds, because... they use the same chips... Micron D9GMH. You only need handpicked if you plan on breaking some OC'ing records.
 
enginurd said:
Jee, that looks familiar!?!? :eek: quote me next time plz ;) and use the right calculations for the CPU he chose, lol.
Click to expand...


Sorry meant to quote you :(.

I didn't notice that he was thinking about the 1333 bus speed CPU. lol
 
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