Part Number Decoder
In contrast to other Kingston offerings, the HyperX kit series is specially designed for PC gaming enthusiasts and PC users in the pursuit of high performance. Through high-bandwidth and low latency timing parameters, Kingston’s HyperX series is guaranteed to deliver substantial improvements in your PC’s performance. We have provided an easy method of differentiating the assortment of models available so that you might better understand HyperX’s specifications and performance. For more information on Kingston’s line of HyperX modules, click here.
Definition of timing:
Latency timing is an important indicator of HyperX’s performance in actual applications. We have provided a brief description of different definitions in the following table so that you might have a better understanding of different timings and what they represent. Simply put, the lower these figures are, the faster the memory kit will be able to complete data read/write operations and perform the designated operation at the next address -- for improved performance.
Using KHX1800C8D3T1K2/2G as an example with latency timing of 8-8-8-24, each timing refers to:
|
| Timing | Definition | Abbreviations | What it does |
|
| 8 |
CAS Latency |
CL |
The delay time which elapses between the confirmation data's array location and the moment the row addressing strobe (RAS) accesses a particular column in a selected row, and the number of clock cycles required for the data to move from the given array location to the bus. |
|
| 8 |
RAS to CAS
(Row to Column delay) |
rRCD |
The number of delay clock cycles for the signal to move from row to column. |
|
| 8 |
The number of delay clock cycles for the signal to move from row to column |
tRP/tRCP |
The number of clock cycles required to close a specific row and activate another row. |
|
| 24 |
Row Active Delay
(or RAS Active Delay, or time to ready) |
tRA/tRD/tRAS |
The number delay clock cycles for reactivation of a row upon completion of an operation. |
Why would the frequency become faster as timing increases?
Ideally, the timing should be kept as low as possible as long as the system is working under the same frequency. However, with new high-bandwidth memory products, you may notice that the timing parameters tend to be higher compared to low-bandwidth products. The difference in speed can be illustrated with the following example:
| Kingston Part Number | Memory Specification | Actual Clock | Unit time | CL | Actual CL | Actual latency (total) |
|
| KHX8500D2/1G |
DDR2-1066 |
533MHz |
1.876ns |
5 |
9.38ns |
56.28ns (5-5-5-15) |
|
| KHX6400D2LL/1G |
DDR2-800 |
400MHz |
2.5ns |
4 |
10ns |
60ns (4-4-4-12) |
|
| Standard DDR2-1066 |
DDR2-1066 |
533MHz |
1.876ns |
7 |
13.132ns |
78.792ns (7-7-7-21) |
|
| Standard DDR2-800 |
DDR2-800 |
400MHz |
2.5ns |
5 |
12.5ns |
75ns (5-5-5-15) |
|
| Standard DDR2-667 |
DDR2-667 |
333MHz |
12ns |
4 |
12ns |
72ns (4-4-4-12) |
|
If we were to compare DDR2-800 to DDR2-667, despite the difference of 1 in the timing value, the difference in actual CL between both is a mere 0.5ns, which means the difference in latency would be negligible. But when it comes to the speed of data transfer at the same frequency, DDR2-800 would naturally outperform DDR2-667. This is one of the primary strengths of HyperX. Regardless of high frequency or low latency timing, Kingston memory kits will shorten latency time for your system and deliver better performance and speed with the same operating voltage.
Note:
- Kingston has performed rigorous testing on all HyperX memory kits configured to parameters shown on the product label. However, the product may not operate on some motherboards or systems due to outdated firmware.
- Kingston does not recommend that users attempt to run their computers faster than the published frequencies or timings. Inappropriate parameter configurations may result in damage to your hardware.
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