- Apr 10, 2013
- 71
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- 10,630
The sticks alone are DDR3-1333 and operate at 1066 rate (due to Core i7 controller limitation). The timings reported in BIOS are 7-7-7. But, when I plug two such sticks into the same channel, I get 8-8-8 in the overloaded channel. Other channels are 7-7-7.
CPU-Z reports that I still have triple-channel but timings are 7-8-8 (it does reports channel timings separately).
It was a 4th stick in a 3-channel (6 slots) architecture and I provide this information for common good rather than ask a question. Memories are identical memories from different vendors.
So, when combining memories, do not forget the electrical characteristics, which degrade when multiple skicks operate in the same channel. When I see that 4 sticks operate worse in 3-channel mode it might be the electrical problem rather than escaping 3-channel. The electrical load problem is that (WP: Propagation delay increases with operating temperature, marginal supply voltage as well as an increased output load capacitance. The latter is the largest contributor to the increase of propagation delay. If the output of a logic gate is connected to a long trace or used to drive many other gates (high fanout) the propagation delay increases substantially.) )
CPU-Z reports that I still have triple-channel but timings are 7-8-8 (it does reports channel timings separately).
It was a 4th stick in a 3-channel (6 slots) architecture and I provide this information for common good rather than ask a question. Memories are identical memories from different vendors.
So, when combining memories, do not forget the electrical characteristics, which degrade when multiple skicks operate in the same channel. When I see that 4 sticks operate worse in 3-channel mode it might be the electrical problem rather than escaping 3-channel. The electrical load problem is that (WP: Propagation delay increases with operating temperature, marginal supply voltage as well as an increased output load capacitance. The latter is the largest contributor to the increase of propagation delay. If the output of a logic gate is connected to a long trace or used to drive many other gates (high fanout) the propagation delay increases substantially.) )
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