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DDR2 vs DDR3

D

Darkmind

New Member
Joined
May 23, 2005
Messages
159 (0.02/day)
System Specs
Processor Intel Pentium Dual-Core E6600 @ 3GHz (333x9)
Motherboard Gigabyte GA-P35-DS3L
Cooling CM GeminII S
Memory G.SKILL 2x2GB @ DDR2 1000 @ 5-5-5-15
Video Card(s) XFX ATI Radeon 5870 1GB
Storage Seagate Barracuda 7200.10 320GB
Display(s) Samsung 2220ex 21.5in
Case Antec 900 w/ 3 120mm intake fans, 1 120mm rear exhaust fan, 1 200mm top exhaust fan
Audio Device(s) SB Audigy 2ZS w/ Logitech x-530 5.1 speakers
Power Supply Antec Trupower 750w
Software Windows Vista Ultimate 32-bit
Any benchmark reviews that include DDR2-1066 CAS5 and DDR3-1333 CAS7? I tried finding some but I can't.
 
I don't think you will find any comparison in a single review since DDR3 and DDR2 usually require different motherboards as well.
 
ddr2 i still think is quicker for the moment because of the insane timmings of ddr3 it doesnt really benfit if you get some ddr2 up to 1200mhz+ then ddr3 is screwed really keep with some ddr2 no major benfits
 
ddr3 = currently a waste ...
 
well said :) also very few boards support it ive seen a couple like the new p35 ds3R or P and in another board but i dont see ddr3 taking off really quick i think...
 
I'm not planning on building a computer around DDR3, I just wanna satisfy my curiosity.
 
Reviews say higher latency and higher prices (i.e. ddr3)
 
hat said:
If you're planning on building a new system, just get a good DDR800 set like these:
http://www.newegg.com/Product/Product.aspx?Item=N82E16820146565

Only $63 after rebate shipped!! It's 400MHz 4-4-4-12 by default, and it is Micron D9 garunteed. Can probably do 500MHz 4-4-4-12 stock volts :rockout:
Click to expand...

If I ever get around to actually getting the money for making a new system, those are the mem sticks I plan on getting. One hell of a deal, and apparently they can also overclock to 1066 5-5-5-15 which is faster than 800 4-4-4-12.

I checked out the X-bit labs review, pretty much answers my question. DDR3 is crap right now.
 
Darkmind said:
If I ever get around to actually getting the money for making a new system, those are the mem sticks I plan on getting. One hell of a deal, and apparently they can also overclock to 1066 5-5-5-15 which is faster than 800 4-4-4-12.
Click to expand...
I have em, and mine go to 1200MHz 5-5-5-15 @ 2.4V. They'll also do 1066MHz 4-4-4-12 @ 2.4V.

As far as 1066MHz 5-5-5-15 being faster than 1000MHz 4-4-4-12, that is 100% not true on my system. 1000MHz 4-4-4-12 is faster in every way for me, and also my 24/7 settings @ 2.3v. (I don't recommend running the ram at 2.4V 24/7. Even with a fan, they'll likely burn out eventually.)
 
Erm, I said 800, not 1000. Either way, 1000MHz at 4-4-4-12, that's pretty good.
 
Darkmind said:
Erm, I said 800, not 1000. Either way, 1000MHz at 4-4-4-12, that's pretty good.
Click to expand...
DOLT! Sorry, don't know where I got 1000MHz from. lol :toast:
 
Is it really 1000MHz or DDR1000 (500MHz)?
 
Mine does 326MHz 4-4-4-12-12 2T at 2V. I tried 1T once and I had to clear the CMOS... :p
I would have it running at 333, but my memory speed is determined by my CPU speed, and I have 4 dividers (200MHz, 266MHz, 333MHz, 400MHz). 200MHz is CPU/13 I believe, 200MHz CPU/10, 333MHz CPU/8 and 400MHz CPU/7.

If I really wanted 333MHz I would need to bump my CPU speed to 2664MHz, which is really no big deal (206x13) and Ht link would only be 1030... I may try it later. But that means 334.75MHz true memory... slightly faster than DDR667 :P
 
hat said:
Mine does 326MHz 4-4-4-12-12 2T at 2V. I tried 1T once and I had to clear the CMOS... :p
I would have it running at 333, but my memory speed is determined by my CPU speed, and I have 4 dividers (200MHz, 266MHz, 333MHz, 400MHz). 200MHz is CPU/13 I believe, 200MHz CPU/10, 333MHz CPU/8 and 400MHz CPU/7.

If I really wanted 333MHz I would need to bump my CPU speed to 2664MHz, which is really no big deal (206x13) and Ht link would only be 1030... I may try it later. But that means 334.75MHz true memory... slightly faster than DDR667 :P
Click to expand...
I'm still willing to bet 400MHz is possible with a little more juice. Even tho it's their value ram, it still has some form of D9s on them. Well, at least my DDR2-533 2x512MB Crucial value kit does.
 
I set 206x13 = 2678MHz CPU... which ment 335MHz memory. Put the PC started just shutting down on me... memory needing more juice. I really don't want to give it more than 2V.

//I know it's the memory because I ran my CPU at 2750MHz 1.325V which is 150MHz over stock and undervolted. HT link only 1030, no fault there... gotta be the memory.
4-4-4-12-12-2T 2v. I don't think 10MHz more is worth the extra power, or running it at 2V with 5-5-5-15.

It's this memory btw: http://www.newegg.com/Product/Product.aspx?Item=N82E16820146569

I don't think it's value ram, it just doesn't have Ballistix or Tracer branded on it, nor does it come with heatspreaders (my uncle bought some seperately and put them on, heh)

If it is value ram I wouldn't doubt it either. 2V 325MHz 4-4-4-12-2T 2V and won't do 335MHz 4-4-4-12 2T 2V kinda sucks... but the whole damn thing only cost me like $200 in TOTAL for everything in my specs, save the monitor and PCI fan.
 
ddr= double data rate (or dual, no diff) so if you get 500mhz on cpuz, you're ram is really working at ddr21000, which would be 1000 mhz, though usually people just say 500 mhz since cpuz says it like that.
 
your crucials will take more then 2v, they'll love the 2.5v lol, well if they have micron d9's, which love the extra juice.
 
Yeah I know it is supposedly warrantied up to 2.2V but I still don't like giving it more than 2V.
cpu-z doesn't report having a D9 in the part number or serial number.
 
that is nuts :p 2058mhz but the timmings arent that bad still very quick
 
When people see "tCL8" they automatically think it's very slow.
This is not the case.

Latencies are usually measured in "clock cycles" such as "tCL", "tRCD", "tRP" and "tRAS" these four considered as most important. Clock cycle is one single clock tic of the circuit, the the frequency of the circuit ditates how long a time a clock cycle (cycle length) takes.

Frequency (Hz) = 1/s (Hz = 1 tic per second -> MHz = 1 million tics per second)

Cycle time (1 tic) is as follows:
1s / frequency
=
1s / 1029MHz (DDR3-2058)
=
1 000 000 000ns / 1 029 000 000Hz
=
1 000 000 000ns / 1 029 000 000 1/s (1029 million tics per second)
=
0.97ns / tic
Thus the higher the frequency, the lower the cycle time.
-> the same latency (in nanoseconds) at higher amount of "clock cycles of latency"

Thus:
1029MHz (DDR3-2058) 8-6-6-18 (tCL-tRCD-tRP-tRAS)
equals:
515MHz (DDR2-1029) 4-3-3-9
equals:
258MHz (DDR-515) 2-1.5-1.5-5
=
tCL: 7.75ns - tRCD: 6ns - tRP: 6ns - tRAS: 18ns (ns = nanoseconds)

tCL8 @ DDR3-2058 is an equal amount of time as tCL2 @ DDR1-515; 7.75 nanoseconds to be exact.
 
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