E5-575 wifi speed capped to 72mbps

dskarava69
dskarava69 Member Posts: 4 New User
edited March 2023 in 2017 Archives

HI all,

I bought a second acer, after the first which I bought 3 years ago.

They are both working in the same room and attached to the same router

The old one is E3 celeron, the new one is I5 E5-575G.

.... and .... the old one is connected 144 MBps the new one at 72MBps

... uhm ... really strange I've an Atheros QCA9377

 

any idea ?

 

Ciao

Thanks in advance to everybody

Best Answer

  • dskarava69
    dskarava69 Member Posts: 4 New User
    Answer ✓

    ... so I went in the office with old E1-522 and new one,

    with office router 300N the E5-575 jumped to 150MBps speed....

    ... but the old E1-522 is able to 300MBps.

     

    So as a result the E5-575 is half speed of E5-575 (old ARBW222etc... vs QCA9377) It seems that 20/40 Mhz aggregation

    maybe QCA9377 will do the best in 5ghz 802.11ac but I don't have it neither home nor office.

     

    Finally I found proper tech doc qualcomm strategy-analytics-802-11ac-wave-2-with-mu-mimo the QCA9377 is little brother of QCA9378:  9377 is 1x1 while 9378 is 2x2. Using and old 802.11n router 1x1 means single stream and max rate is 150Mbps but in theory withh 802.11ac .... this wifi is able to cross 1.7 Gbps !!!

Answers

  • brummyfan2
    brummyfan2 ACE Posts: 28,468 Trailblazer

    Hi,

    You could try using different band, switch to 5GHz if you have 2.4GHz or the other way around, try switching to differen DNS address, either OpenDNS or GoogleDNS, even reinstalling the driver might help.

    Acer Predator PT516-51s Performance Results - UserBenchmark

  • Trukntigger
    Trukntigger Member Posts: 256 Mr. Fixit WiFi Icon

    Agree with  brummy, the newer wifi cards inside laptops are having issues with some routers. Seems like everything else, as hardware improves backwards compatibilty suffers.  You may have to play with your settings on either end (laptop or router) to tweak the performance.  Now- if you notice this everywhere you go like say a local hotspot that your other did fine at then I would dig a bit further.  The wifi module (model depending) has 1-2 wires plugged into it (black and a white) which are the attenna wires that route up the left and right sides of the lcd panel.  One of these may be loose ( unplugged) which then would cause range/speed issues.Only suspect this after you been to other wifi spots you knew worked fine on other laptop.  There will always be some fine variance but not huge without actual issue with machine.

  • dskarava69
    dskarava69 Member Posts: 4 New User

    I will bring the laptop with me in office, but I suspect that the old Qualcomm Atheros AR5BWB222 on board Aspire V5-531 is better than the new one.

    I'll let u know asap.

    Ciao

    Diego

  • dskarava69
    dskarava69 Member Posts: 4 New User
    Answer ✓

    ... so I went in the office with old E1-522 and new one,

    with office router 300N the E5-575 jumped to 150MBps speed....

    ... but the old E1-522 is able to 300MBps.

     

    So as a result the E5-575 is half speed of E5-575 (old ARBW222etc... vs QCA9377) It seems that 20/40 Mhz aggregation

    maybe QCA9377 will do the best in 5ghz 802.11ac but I don't have it neither home nor office.

     

    Finally I found proper tech doc qualcomm strategy-analytics-802-11ac-wave-2-with-mu-mimo the QCA9377 is little brother of QCA9378:  9377 is 1x1 while 9378 is 2x2. Using and old 802.11n router 1x1 means single stream and max rate is 150Mbps but in theory withh 802.11ac .... this wifi is able to cross 1.7 Gbps !!!

  • Trukntigger
    Trukntigger Member Posts: 256 Mr. Fixit WiFi Icon

    Simplex vs duplex sounds like to me. I'm all ac now so can't say on older b-g-n never use anymore. 

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