|
22 September 2014, 12:22
|
#1 |
|
Registered User
Join Date: Apr 2010
Location: London / UK
Posts: 420
|
A3640 Performance Anomaly
I have just picked up an A3640 board and noticed something odd in the SysSpeed benchmarks. The 040 chip has been upgraded from a 25mhz one to a 33mhz one. With a 50mhz crystal, it is returning roughly 66% of the 'MIPS' of a standard 040/25, and with a 66mhz crystal it is returning exactly what a standard 040/25 card should.
Why is this? I assumed that with a 50mhz crystal it would perform the same, and with 66mhz it would be faster. |
|
|
22 September 2014, 12:40
|
#2 |
|
Ya' like it Retr0?
Join Date: Jul 2005
Location: United Kingdom
Age: 49
Posts: 9,768
|
@edd jedi
That is interesting, possibly a delay line fix gone bad? Take some pictures of the top of the card and I am sure we can advise better. An 040 running at 25MHz should give you about 18.1 MIPS An 040 running at 33MHz should give you about 23.5 MIPS An 040 running at 50MHz should give you about 37.5 MIPS These are common results of SysInfo |
|
|
|
22 September 2014, 12:45
|
#3 |
|
Registered User
Join Date: Apr 2010
Location: London / UK
Posts: 420
|
Ah, that's worrying, that's what I thought too. Here are some photos from the ad I bought it from (please note not mine):
Board: 50mhz: 66mhz: |
|
|
|
22 September 2014, 12:58
|
#4 |
|
Thalion Webshrine
Join Date: Jan 2004
Location: Oxford
Posts: 14,332
|
Does the performance vary depending on which 040 library you have installed? And whether or not you have OxyPatcher etc?
What about memory speed? |
|
|
22 September 2014, 12:59
|
#5 |
|
Registered User
Join Date: Apr 2010
Location: London / UK
Posts: 420
|
I'll have to let you know, I haven't actually installed it yet as I've just moved house, I just noticed the oddity in the sales thread I bought it from after receiving it.
|
|
|
|
22 September 2014, 13:06
|
#6 |
|
Thalion Webshrine
Join Date: Jan 2004
Location: Oxford
Posts: 14,332
|
Bah! It's going to be bad screenshots
|
|
|
|
23 September 2014, 21:16
|
#7 |
|
Registered User
Join Date: Dec 2009
Location: Poole UK
Posts: 349
|
100% wrong 68040 library
|
|
|
|
26 September 2014, 12:35
|
#8 |
|
Registered User
Join Date: Apr 2010
Location: London / UK
Posts: 420
|
OK thanks, which one should I be using?
|
|
|
|
27 September 2014, 02:47
|
#9 |
|
Registered User
Join Date: Jul 2012
Location: USA
Posts: 239
|
Those results could be from no 68040.library too.
|
|
|
|
09 October 2014, 11:54
|
#10 |
|
Registered User
Join Date: Apr 2010
Location: London / UK
Posts: 420
|
Thanks guys you were right, all good with an 040 library present and the jumpers set correctly.
|
|
|
|
12 October 2014, 10:05
|
#11 | |
|
0ld0r Git
Join Date: Mar 2009
Location: Cornwall, UK
Posts: 1,570
|
Quote:
|
|
|
|
| Currently Active Users Viewing This Thread: 1 (0 members and 1 guests) | |
| Thread Tools | |
Similar Threads
|
||||
| Thread | Thread Starter | Forum | Replies | Last Post |
| network performance tests | Schoenfeld | request.Other | 12 | 14 September 2023 17:01 |
| Getting more performance out of my A1200 | Devlin | support.Hardware | 4 | 18 December 2013 18:17 |
| Stuttering and slow performance | 8bitbob | support.WinUAE | 8 | 04 November 2012 21:42 |
| PSPUAE Performance | tonyyeb | support.OtherUAE | 73 | 27 January 2011 16:45 |
| How do I get the best WB performance? | Rabbit80 | support.Apps | 27 | 01 July 2009 11:29 |
|
|
