I was thinking about picking up some memory on eBay and dropping it into my station to max out the memory. I have 32MB in there now, but I figure 128MB would be a little nicer. Looked around a bit and found old shop listings for NeXT upgrade kits, 72 pin simms, non-parity in sets of two (meaning four 32MB sticks in my case). Are there any concerns people here have run into with doing this kind of upgrade? I think it'll make running some things a little easier, but I don't want to either pick up the wrong thing or damage my station. Thanks for the input...
Kept digging and found specs for other NeXT equipment, this is what I've found:
72 pin
non-parity
80 ns (minimum)
Any other specs that I'm missing? Thanks.
I've got FPM 70ns parity in mine Viking branded which I got of eBay US.
Before that I robbed the ram out of my 840av (OWC 60ns non parity FPM) and that worked fine in my NeXT.
EDO also works fine at least the stuff I tried out of a Pentium.
I read that the turbo chipset is timed to run best (optimum) with 70ns, apparently there are conflicting reports that using faster memory may in fact make the chipset access the ram slower.
Quote from: "brams"
I read that the turbo chipset is timed to run best (optimum) with 70ns, apparently there are conflicting reports that using faster memory may in fact make the chipset access the ram slower.
This must be an urban legend, 60ns RAM works fine. See the second diagram:
http://www.koplien.de/henry/NeXT/Hardware/MemoryBenchmark.html
Some excellent info, and it even had graphs (what can I say, the slightly dormant college student loves graphs). A hunting for memory I shall go... I'm curious to see the preformance difference with four times the memory.
Well I figured that it was was crap, however I did read it in something like the NeXT faq that 60ns worked slower than 70ns. All my 60ns is back in the 840av now.
I can't quite make out the bottom legend on the graph 'cos of the color, I can see Turbo on there at 60ns, but I could not see it comparing at against 70ns. 60ns FPM is getting a bit thin on the ground these days
http://www.channelu.com/NeXT/NeXTFAQ-html/NeXTFAQ.099.htmlDid anybody compare 70ns ram against 60ns in a Turbo NeXT?
Quote from: "brams"
Did anybody compare 70ns ram against 60ns in a Turbo NeXT?
The graph from the Turbo Cube and the Mono Station 25MHz with Turbochipset and non-Turbochipset are supplied by me.
if i remember correctly my tests: The 25 MHz machine with the Turbochipset had the same memoryperformance with 100ns, 70ns or 60ns, no difference.
So i assume the 25MHz are the limitating factor or the Turbochipset is throttled down for using with these CPU clock.
A machine with the non-Turbo-Chipset brings the same memeoryperformance as the 25MHz Turbochipset machines, so the only goal on 25MHz machines with Turbochipset is to equip with 128MB RAM.
If i remeber correctly the 33MHz Turbo Machines benfit from 60ns, 70ns was slightly slower, so 60ns make sense in 33MHz machines.
Some results:
TurboCube 128MB/60ns:
Blockgröße[Bytes] [MB/s]
1 0.467473
2 0.945761
4 1.950337
8 3.775993
16 7.124238
32 12.319481
64 19.382128
128 28.923314
256 37.352521
512 43.572852
1024 47.336426
2048 32.244367
4096 15.209145
8192 14.180580
16384 13.760043
32768 13.519121
65536 13.458161
131072 13.385968
262144 13.364047
524288 13.352427
1048576 13.354700
2097152 13.219652
4194304 13.348695
8388608 13.235106
16777216 13.232599
33554432 13.236185
sieht schneller aus als die übrigen Werte, also anscheinend wirklich
Turbo, Dank 128MB kein swappen bei 16/32 MB.
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Mono 25MHz, aber mit Turbochipsatz 128MB/60ns:
1 0.355321
2 0.708249
4 1.459353
8 2.834544
16 5.327962
32 9.229507
64 14.962374
128 21.634775
256 27.927864
512 32.642669
1024 35.457814
2048 26.775620
4096 12.680326
8192 11.799577
16384 11.422015
32768 11.267563
65536 11.180351
131072 11.148413
262144 11.119809
524288 11.100224
1048576 11.078902
2097152 11.106286
4194304 11.113999
8388608 11.007792
16777216 11.014657
33554432 11.010836
Bis auf die letzten beiden Werte, die Dank 128MB nicht einbrechen, keinerlei
Vorteil des Turbochipsatzes, die 25MHz CPU limitiert.
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Mono 25MHz, aber mit Turbochipsatz 64MB/70ns:
1 0.359235
2 0.708100
4 1.464079
8 2.830607
16 5.330108
32 9.223673
64 14.945290
128 21.029622
256 27.936646
512 32.622021
1024 35.368922
2048 23.200201
4096 12.427681
8192 11.716185
16384 11.403301
32768 11.229193
65536 11.184671
131072 11.121180
262144 11.114066
524288 11.098095
1048576 11.105535
2097152 11.095392
4194304 11.098796
8388608 10.998303
16777216 11.010146
33554432 2.246775
Die 32MB brechen ein, sonst kein Unterschied zwischen 60/70ns.
-------------------------------------------------------------------------------
Mono 25MHz, non-Turbo 32MB/100ns:
1 0.357507
2 0.705659
4 1.452507
8 2.811173
16 5.319396
32 9.184482
64 14.908904
128 21.509636
256 27.778851
512 32.393036
1024 35.168808
2048 26.327232
4096 11.946678
8192 11.271416
16384 10.945634
32768 10.772987
65536 10.745150
131072 10.735818
262144 10.689081
524288 10.655677
1048576 10.640122
2097152 10.653142
4194304 10.670748
8388608 10.499019
16777216 1.886225
33554432 1.438541
IMHO kein Unterschied zum Turbochipsatz bei 25MHz Maschinen.
God thing that I never threw out that old Mac memory, when I get my NeXTstation will need to pop some in cause it is only coming with 32MB.
Quote from: "matrix01"God thing that I never threw out that old Mac memory, when I get my NeXTstation will need to pop some in cause it is only coming with 32MB.
Some of the old non-Turbo stations will only handle 32mb. 8 slots of 30 pin simms 4x8 for a maximum of 32mb.