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Test Results (Continued)
CAS 2.5 Results
CAS 2.5 is probably the sweet spot for TCCD modules. There is no need to sacrifice too much in terms of clock speed and yet you will be able to maintain reasonably tight timings.
| Parameters |
Values |
Unit |
| Row Active Delay (tRAS) |
7 |
Clock Cycles |
| RAS-to-CAS Delay (tRCD) |
3 |
Clock Cycles |
| Row Precharge Delay (tRP) |
3 |
Clock Cycles |
| Stock Voltage |
2.65 |
V |
Boosted Voltage |
2.85 |
V |
| Memory
Clock |
2.65V |
2.85V |
| 250MHz / 500MHz DDR |
Stable |
Stable |
| 253MHz / 506MHz DDR |
Stable |
Stable |
| 255MHz / 510MHz DDR |
Stable |
Stable |
| 258MHz / 516MHz DDR |
Stable |
Stable |
| 260MHz / 520MHz DDR |
Stable |
Stable |
| 263MHz / 526MHz DDR |
Stable |
Stable |
| 265MHz / 530MHz DDR |
Stable |
Stable |
| 268MHz / 536MHz DDR |
Stable |
Stable |
| 270MHz / 540MHz DDR |
Stable |
Not Stable |
| 273MHz / 546MHz DDR |
Stable |
Not Stable |
| 275MHz / 550MHz DDR |
Stable |
Not Stable |
| 278MHz / 556MHz DDR |
Not Stable |
Not Stable |
| 280MHz / 560MHz DDR |
Not Stable |
Not Stable |
| 283MHz / 566MHz DDR |
Not Stable |
Not Stable |
| 285MHz / 570MHz DDR |
Not Stable |
Not Stable |
Just like the CAS 2 results, this is equally as impressive!
At the timings of 2.5-3-3-7, PDP Systems has only rated these modules to run at 250MHz. But they didn't stop there. In fact, they didn't stop until they hit 275MHz! That's equivalent to PC4400 speed!
By looking at the results table, you can tell that it would be pointless for you to run them at higher voltages as these modules doesn't seem to appreciate additional voltage.
CAS 3 Results
History has shown that even with CAS Latency 3 support, TCCD never really needed these slower timings for higher clock speed unless maximum memory speed is what you must have, instead of maximum performance. Let's see how they do!
| Parameters |
Values |
Unit |
| Row Active Delay (tRAS) |
8 |
Clock Cycles |
| RAS-to-CAS Delay (tRCD) |
4 |
Clock Cycles |
| Row Precharge Delay (tRP) |
4 |
Clock Cycles |
| Stock Voltage |
2.65 |
V |
Boosted Voltage |
2.85 |
V |
| Memory
Clock |
2.65V |
2.85V |
| 275MHz / 550MHz DDR |
Stable |
Stable |
| 278MHz / 556MHz DDR |
Stable |
Stable |
| 280MHz / 560MHz DDR |
Stable |
Not Stable |
| 283MHz / 566MHz DDR |
Not Stable |
Not Stable |
| 285MHz / 570MHz DDR |
Not Stable |
Not Stable |
Increasing the timings only yielded a small increase of 5MHz over what we attained with a CAS latency of 2.5. But then again, our test bed could have prevented the memory from reaching a much higher clock speed.
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