what's the difference between SDRAM and DRAM

[ilyas001]

hi guys i don't get the difference and know it have something o do with the clock speed synchronization how and for what purpose i don't get it ? thanks 

[vorticalbox]

https://www.quora.com/What-is-the-difference-between-DRAM-SRAM-and-SDRAM

[glitchmaster0001]

Dram is dynamic random access memory and SDRAM is Synchronous dynamic random access memory

[Djole123]

In a nutshell, SDRAM is DRAM that is synchronised with the CPU more than standard DRAM, hence the synced DRAM name. Since it's like that, it resolves some of the bottlenecks.

[ilyas001]

2 hours ago, Djole123 said:

In a nutshell, SDRAM is DRAM that is synchronised with the CPU more than standard DRAM, hence the synced DRAM name. Since it's like that, it resolves some of the bottlenecks.

yes mate i understood that what i can't find is a good explanation about that synchronization i searched i can't find a good answer what you say is what i already know i need more informations pls 

[agent_x007]

Pick a definition :
SRAM vs DRAM - Static RAM and Dynamic RAM.

SDRAM - DRAM type of memory, that is controlled by external clock (it's "synchronised" to it).
Old style DRAM's did something (read/write), as soon as "signal" appeared. SDRAM requires control signal to appear first (again - it's sync to it).

SDR SDRAM -
PC memory that does transfer only on rising side of signal (ex. PC133).
DDR SDRAM -
Does transfer on both sides of signal ie. rising and falling edges ex. PC3200 (or 400MHz effective).

[ilyas001]

8 minutes ago, agent_x007 said:

Pick a definition :
SRAM vs DRAM - Static RAM and Dynamic RAM.

SDRAM - DRAM type of memory, that is controlled by external clock (it's "synchronised" to it).
Old style DRAM's did something (read/write), as soon as "signal" appeared. SDRAM requires control signal to appear first (again - it's sync to it).

SDR SDRAM -
PC memory that does transfer only on rising side of signal (ex. PC133).
DDR SDRAM -
Does transfer on both sides of signal ie. rising and falling edges ex. PC3200 (or 400MHz effective).

 (it's "synchronised" to it).  this is what i want to know more about . how is it done ? and i think only the sdram can be synchronized   not the dram . 

[agent_x007]

"SDRAM and DRAM" is kinda like a "square and ractangle" type of thing
All squares are rectangles, but not all rectangles are squares.
In short : SDRAM is a type of DRAM.

I think wikipedia article about DRAM may help you : LINK.

[Djole123]

59 minutes ago, ilyas001 said:

 (it's "synchronised" to it).  this is what i want to know more about . how is it done ? and i think only the sdram can be synchronized   not the dram . 

It tries to match clockspeeds. What will SDRAM do is kind of "turbo boost" itself and lower the CPU and RAM clockspeed delta so it can keep up with the CPU.

[ilyas001]

44 minutes ago, Djole123 said:

It tries to match clockspeeds. What will SDRAM do is kind of "turbo boost" itself and lower the CPU and RAM clockspeed delta so it can keep up with the CPU.

thanks mate now i got it so from what i understand sdram and dram are same thing just that dra is the evolution of sdram and dram is the one that camed with ddr 1 2 3 and now 4 right ? they have both the capabilities to self boost themselfs to math the cpu for better performance if i'm right ? now what's the name of the ram system that didn't have this synch technology ? how that turbo boost works exactly ? and with it can it match the sram speed  (because you said keep up with the cpu)? thanks 

[Curious Pineapple]

DRAM reads and writes data on it's own time, meaning the CPU may have to wait for data to be read from, or written to memory. SDRAM is controlled by the CPU. If the CPU needs to write data to memory, it sends the data to memory along with a write signal, and the memory stores the data the instant the CPU commands it to. Same with reading, the CPU asks the memory for data, sends the read signal, and the data is immidiately available for the CPU to use.

 

It's like making the memory a part of the processor, rather than a seperate system, sort of.