Where is QDR RAM?
Where is QDR RAM?
You're curious about QDR RAM—new tech that promises faster access times. It's still emerging, not widely available yet, and developers are working through challenges before it becomes mainstream.
The information you're asking about doesn't directly relate to the Wiki Quad data rate. It seems you might be conflating different concepts. Let me know if you'd like clarification!
GDDR5 and its successors can be considered a type of QDR memory. The actual transfer rate of GDDR5 is four times the real speed, meaning a 1750 MT/s module would effectively move at 7000 MT/s. In contrast, standard DDR achieves roughly double its actual speed—like 2666 MT/s becoming about 5333 MT/s. Applying this logic to your GTX 960, the calculation shows an effective throughput of around 112 GB/s versus approximately 25.6 GB/s for DDR3.
According to what I understand, no QDR was employed for the system memory in a P4 PC or any other consumer PC. It used SDR, RDRAM with high-speed operation that produced significant heat, and original DDR in later versions. I believe DDR2 existed just before Conroe was introduced.
The P4 uses a quad Front Side Bus design. Two strobes operate at 266 MHz, which equals 533 MHz memory frequency. One strobe runs at 133 MHz. Therefore, four strobes together would produce 533 MHz, but data transmission would actually occur at 266 MHz.