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striker@epc

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tT
發表於 2021-12-16 23:15 | 只看該作者

[操作疑難] notebook RAM速度問題

我有兩部notebook
1. Thinkpad T490s, DDR4 2400 dual channel
2. Thinkbook 13s gen 2, LPDDR 4266 dual channel

用AIDA64, T490s行到30GB/s, Thinkbook行到60GB/s, 結果好合理
但係當我用imdisk開ramdisk，之後行cristaldiskmark，T490s上到6-7GB/s sequential read，但係部thinkook最多去到5GB/s sequential read

有無師兄知道點解？
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KinChungE

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發表於 2021-12-17 13:13 | 只看該作者
本帖最後由 KinChungE 於 2021-12-17 13:16 編輯

LPDDR4/LPDDR4X係會bandwidth慢一半
https://www.hardwaretimes.com/lp ... ats-the-difference/
Compared to DDR4, LPDDR4 offers reduced power consumption but does so at the cost of bandwidth.

所以新機慢D係合理
另外仲要睇插火牛唔插火牛
越新既機, 預設計唔插火牛會降頻越勁

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striker@epc

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發表於 2021-12-18 01:33 | 只看該作者
LPDDR4/LPDDR4X係會bandwidth慢一半

Compared to DDR4, LPDDR4 offers reduced power consumption but doe ...
KinChungE 發表於 2021-12-17 13:13



    唔該師兄
但係點解用AIDA64測試，LPDDR4X會快過DDR4？

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KinChungE

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發表於 2021-12-18 15:04 | 只看該作者
唔該師兄
但係點解用AIDA64測試，LPDDR4X會快過DDR4？
striker@epc 發表於 2021-12-18 01:33


個人建議你check左CPU係咪降左頻先
RAMDisk bottleneck通常唔係RAM

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striker@epc

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5#
發表於 2021-12-19 04:59 | 只看該作者
個人建議你check左CPU係咪降左頻先
RAMDisk bottleneck通常唔係RAM
KinChungE 發表於 2021-12-18 15:04



    唔該師兄，我行crystaldisk睇下cpu速度

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