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25112

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how much speed can one laptop wifi or ethernet cable handle?

these days, cable internet has exponentially growth in speed capacity compared to dsl (up to 100 Mbps or more).
           
           Can the laptop truly handle that much speed, even though it is available?
           
           how can you check what is the max speed the laptop wifi or ethernet can handle?
           
           Thanks.
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25112

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can you suggest - what is a DU Meter and how to use it on your router?
wifi is always slower than wired as a general rule (unless wifi device is right next to router with no blocks)..is that true?
by "network cable", you mean Ethernet cable, right? are all Ethernet cable the same?
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Thanks.

In review, it seems like HDD can be a big influence,

Considering all 7200K drives,

how can I find out the capacity of the below? can they be ready by the numbers they represent?

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Router:GT704WGB
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Broadcom NetXtreme 57xx Gigabit Controller
Dell Wireless 1490 Dual Bank WLAN Mini-Card
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Atheros AR8152/8158 PCI-E FastEthernet Controller (NDIS 6.20)
Atheros AR9285 Wireless Network Adapter
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Dell Wireless 1502.802 11b/g/n
Microsoft Virtual Wifi Miniport Adapter
Realtek PCIe GBE Family Controller

The above router right  now gives 3 Mbps, but if you introduce a 25 Mbps router in replacement, then, can these devices still handle it (or make use or the new speeds).

I see how fmarshall suggests testing practically.. Is it possible to find out theoretically what these can perform in the numbers/names they represent?
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@25112  - Thank you and I was happy to help.