220-801 · Question #21
Which of the following memory types has 184 pins?
The correct answer is B. DDR. DDR (Double Data Rate) SDRAM uses a 184-pin DIMM form factor, distinguishing it from later DDR generations.
Question
Which of the following memory types has 184 pins?
Options
- ADDR3
- BDDR
- CSDRAM
- DDDR2
How the community answered
(25 responses)- A4% (1)
- B92% (23)
- D4% (1)
Why each option
DDR (Double Data Rate) SDRAM uses a 184-pin DIMM form factor, distinguishing it from later DDR generations.
DDR3 uses a 240-pin DIMM connector and operates at 1.5V, with a notch position different from DDR2 to prevent cross-generation installation.
Original DDR SDRAM (DDR1) uses a 184-pin DIMM connector for desktop modules, operating at voltages of 2.5V. The 184-pin count is a defining physical characteristic that differentiates DDR from its successors, and the single notch on the module is offset differently to prevent incorrect insertion into other DDR slots.
SDRAM (Single Data Rate) uses a 168-pin DIMM connector and operates at 3.3V, predating the DDR architecture.
DDR2 also uses a 240-pin DIMM connector and operates at 1.8V, sharing the same pin count as DDR3 but with a different notch position.
Concept tested: DDR memory module pin count identification
Source: https://www.jedec.org/standards-documents/docs/jesd79e
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