Bottlenecked, I believe

[TaNaKa52]

Even with that X1550 right there?

 

[Rage_3K_Moiz]

Oh sorry, I didn't know that. The X1550 is the best in that case.

 

[TaNaKa52]

Kk, im als ostarting to notice something with this X1300. All my games start out play smooth at 90+ frames, but then drop down to about 10-20 5 mins later. Thing is, its not my PSU.

 

[wolfram]

Could be overheating (not sure). If the CPU is running too hot, it will throttle down, and could slow down games.

 

[tifc8lraz]

Even with that X1550 right there?

Sorry....guess I need to read up more on the PCI releases .

 

[DelJo63]

>Well, I look at it as 768 is still better than 512.

So that's(1) 256 + (1) 512?

Systems tend to run better when ALL memory slots have EQUAL size cards in them
eg (2) 256 or (2) 512 ... not one of each

 

[MoMo1988]

No only pci x16 and agp x8 sorry.

 

[CCT]

My understanding of DDR memory is that it runs 2x as fast when installed as DDR than it does when NOT.

So, you can run a 512 and 256 as 768 at 200 mhz OR 2 x 512 at 400 Mhz.

 

[CMH]

Hmm...

You can't install DDR RAM as non-DDR RAM.

You're confusing DDR with Dual-Channel RAM. DDR stands for Double Data Rate. Exactly what this means I've really got no idea, I just know that it makes the RAM go 2 times as fast as it should be rated.

Dual channel means running a pair of RAM "at the same time". which further boosts data rate. I've got no idea behind the physics.

So if you ran both your 512 and 256 together, they'd still run at 400mhz. Whereas 512x2 might see 800. I really should read up on dual channel technology...

 

[CCT]

^ I stand, er, sit, corrected.

I got this simple comparison info:

Single rate:

DDR PC3200 at 400 mhz = 3200 mb/s

Double rate:

DDR2 PC3200 at 400 mhz = 6400 mb/s

The thing is, the double rate doesn't occur, afaik, UNLESS two sticks are installed as a pair.

Thus, he gets 768 at single rate 3200 mb/s versus what he could get with 2 x 512 at double rate 6400 mb/s.

I think I got that right this time.

 

[KingCody]

Single rate:

DDR PC3200 at 400 mhz = 3200 mb/s

Double rate:

DDR2 PC3200 at 400 mhz = 6400 mb/s

you have the concept of dual channel memory down right, but you're still confusing the terms "dual channel" with "DDR" (double data rate), they have nothing to do with each other.

DDR refers to the technology of the RAM itself. with older SDRAM, data is transfered once per clock cycle. with DDR SDRAM, data is transfered 2 times per clock cycle (hence double data rate). a DDR400/PC3200 stick runs at 200MHz, and because it's DDR the effective transfer rate is 400MT/s.

Dual channel is a memory configuration (which must be supported by the memory controller) that helps reduce bottlenecks by running a parallel channel. basically, this allows data to be sent and received at the same time

The thing is, the double rate doesn't occur, afaik, UNLESS two sticks are installed as a pair

that is usually the case, however some motherboards/memory controllers allow dual channel operation in odd configurations as well (such as 3 sticks, where slot B+C is equal to stick A).

Thus, he gets 768 at single rate 3200 mb/s versus what he could get with 2 x 512 at double rate 6400 mb/s.

I think I got that right this time

again, that is basically correct you just need to change the term 'double rate' to 'dual channel'.

cheers :wave:

 

[CCT]

^ tx

 

[captaincranky]

Tick Tock, Tick Tock.......

Hmm...



You're confusing DDR with Dual-Channel RAM. DDR stands for Double Data Rate. Exactly what this means I've really got no idea, I just know that it makes the RAM go 2 times as fast as it should be rated.

DDR exchanges data 2 times (2 points)during 1 clock cycle. So, literally tick & tock. I think you're you're actually dealing with an AC sine wave, which switches polarity before returning to null (and beginning the next cycle). This is why the clock frequency is half the data transfer rate.

 

[ceegee]

DDR means that the memory is accessed twice per clock. Think square wave, not ac but dc (what all the capacitors do on your motherboard) It is clocked once when the voltage goes from low to high and again when it goes from high to low. Square wave freq is one complete cycle [low to high until the next low to high transition, with a high to low in the middle of the cycle.] (200mghz) thus if the memory is clocked on the transitions then its apparent frequency is 400 mgz.
Dual channel is exactly what it sounds like, instead of accessing all memory with one set of connections, it accesses it with two (64 bit) channels again increasing apparent memory speed. Of course the memory tells the motherboard how long it has to wait for the circuit to settle (as it were) and that is via the BIOS and the memory timing. (CAS,RAS etc) therefore DDR400 with lower CAS, say 2, will be slightly faster than a CAS of 3 or 4. That was the problem with DDR2 memory cas was higher, but clocks were the same. Now DDR2 is being clocked much faster than DDR and is improving the bandwidth alltogether.