שאלה בקשר לDDR וGDDR

[adirnasri]

אני לא מבין מה ההבדל בין DDR לבין GDDR

מישהו מוכן להסביר מה הבדל בזה?

תודה מראש

[stone cold]

DDR משמש בדרך כלל כזיכרון ראשי

GDDR משמש כזיכרון לכרטיסי מסך

double data rate synchronous dynamic random access memory) is a class of memory integrated circuit used in computers. It achieves greater bandwidth than the preceding single data rate SDRAM by transferring data on the rising and falling edges of the clock signal (double pumped). Effectively, it doubles the transfer rate without increasing the frequency of the clock.

With data being transferred 64 bits at a time, DDR SDRAM gives a transfer rate of (memory bus clock rate) × 2 (for dual rate) × 64 (number of bits transferred) / 8 (number of bits/byte). Thus with a bus frequency of 100 MHz, DDR-SDRAM gives a maximum transfer rate of 1600 MB/s.

JEDEC has set standards for speeds of DDR SDRAM, divided into two parts: The first specification is for memory chips and the second is for memory modules.

As DDR is superseded by the newer DDR2, the older version is commonly referred to as DDR1.

http://en.wikipedia.org/wiki/DDR_SDRAM

GDDR3, Graphics Double Data Rate 3, is a graphics card-specific memory technology, designed by ATI Technologies.

It has much the same technological base as DDR2, but the power and heat dispersal requirements have been reduced somewhat, allowing for higher-speed memory modules, and simplified cooling systems. Unlike the DDR2 used on graphics cards, GDDR3 is unrelated to the JEDEC DDR3 specification. This memory uses internal terminators, enabling it to better handle certain graphics demands. To improve bandwidth, GDDR3 memory transfers 4 bits of data per pin in 2 clock cycles.

Despite being designed by ATI, the first card to use the technology was nVidia's GeForce FX 5700 Ultra, where it replaced the DDR2 modules used up to that time. The next card to use GDDR3 was nVidia's GeForce 6800 Ultra, where it was key in maintaining reasonable power requirements compared to the card's predecessor, the GeForce 5950 Ultra. ATI began using the memory on its Radeon X800 cards. GDDR3 is Sony's choice for the PlayStation 3 gaming console's graphics processor, although the main system memory is comprised of XDR DRAM. Microsoft's Xbox 360 is also shipped with 512 MiB of GDDR3 memory, and is helping to pioneer the use of this memory as standard system memory rather than only video memory.

http://en.wikipedia.org/wiki/GDDR3

[the crazy boy]

DDR - זיכרון ראם

DUAL\DOUBLE DATA RATE

GDDR-

זיכרון גראפי.

G=גראפי

הזיכרון משמש לאיכסון נתונים גראפיים...

משהו כזה :\

[All_eyes_on_me]

ההבדלים בעיקריים בין DDR ל GDDR הם: תדרים , צריכת חשמל,עמידות לטמפ' ורוחב פס להעברת נתונים...

במילים פשוטות יותר, אותם פונקציות אבל מותאם לכרטיסי מסך...

http://www.webopedia.com/TERM/G/GDDR.html

[adirnasri]

אה אוקיי...

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