Re: How to fully realise PCIe 1.0a x1 throughput with a USB-connected SSD?

Posted on 2021-04-23, 05:19

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by feipoa

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Looks like you may have edited your post after I replied, so I did not get your full message in my above response. From that paper, it seems like the data transfer overhead, or encoding overhead, is the most prominent overhead. The paper goes on to mention another approx 1% loss from packet and …

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Re: How to fully realise PCIe 1.0a x1 throughput with a USB-connected SSD?

Posted on 2021-04-23, 02:27

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by feipoa

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

You can't reach 250 MB/s. PCIe overhead is roughly 20%. And you're not helping it with adapter neither, which also will take away some of that bandwidth. From my understanding the "overhead" is the "encoding scheme". PCIe 1.0a x1 spec is for 2.5 GT/s, which is 320 Megabytes per second. Subtract the …

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How to fully realise PCIe 1.0a x1 throughput with a USB-connected SSD?

Posted on 2021-04-23, 01:26

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by feipoa

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

In running some benchmarks with various PCIe USB 3.x cards on PCIe revision 1.0a motherboards, I was noticing that I don't get near the maximum uncoded thoughput of 250 megabytes per second for this PCI express specification. I am using a Samsung 870 EVO SSD connected inside UGREAN USB 3.1 gen2 to …

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Re: Anyone try USB 3.0 vs. USB 2.0 on conventional PCI slots?

Posted on 2021-04-23, 00:39

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by feipoa

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

You are probably technically correct in the naming convention, but in my mind at the time of test, the bridge adapter takes a PCIe card (USB in this case) and turns it into a PCI card, so I was calling it a PCIe-to-PCI bridge adapter. You can also look at it the other way - you are taking a …

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Re: Anyone try USB 3.0 vs. USB 2.0 on conventional PCI slots?

Posted on 2021-04-22, 23:19

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by feipoa

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

I have some additional test results using, both, a noname PCIe-to-PCI bridge adapter and a Startech PCIe-to-PCI bridge adapter. I also tried the Startech USB 3.0 PCI card with kernel 4.15.0 and on another system with 4.4.0 and it still does not function in linux. The lspci terminal function shows …

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Re: PCIe x16 splitter to create two x8 ports?

Posted on 2021-04-22, 01:40

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by feipoa

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

It's a US-based shipping/consignment service offered to vintage computer hardware collectors. This lets me ship all my US bought gear in a single shipment to Canada perhaps once or twice per year. Seems like US sellers usually offer US wide free shipping, so it saves a lot in the end.

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Re: PCIe x16 splitter to create two x8 ports?

Posted on 2021-04-22, 00:11

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by feipoa

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

haha, my favourite is the $786 cable - I bet they sell a lot of those! pentiumspeed: AVICC helps in this regard to some extend, not much on the conversion rate though. Seems like only rising oil prices help in that regard. 'bout time the Canadian economy start to ween off its oil dependence. It is …

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Re: PCIe x16 splitter to create two x8 ports?

Posted on 2021-04-21, 23:26

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by feipoa

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

It's no big deal to make a bracket and tap a few holes in my case to mount the riser and a pair of pcie cards. The RAID has no external slot access and USB can use a break-out cable. But not sure if I can justify the cost of the adapter. There's a seller on a two popular platforms asking $200 USD …

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Re: PCIe x16 splitter to create two x8 ports?

Posted on 2021-04-21, 23:11

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by feipoa

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Interesting. Other than the cable length, do you know if there is any performance degradation of using the riser's onboard bifurcation technology? As it is, I can fully utilise the Samsung EVO 870's bandwidth, at least in mirror mode. If I were to run the x8 RAID with x8 graphics on this x16 port, …

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Re: PCIe x16 splitter to create two x8 ports?

Posted on 2021-04-21, 22:43

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by feipoa

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

The issue with RSC-G2F-A66-X1 is that it will cover the other PCIe slot on the motherboard. Here's the board's layout: https://www.asrock.com/mb/ULI/939Dual-SATA2/ Using RSC-G2F-A66-X1 will trade the AGP, PCIe x1, and PCIex16 slots for two PCIe x8 slots. Stick it on an extension cable. https://www. …

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Re: PCIe x16 splitter to create two x8 ports?

Posted on 2021-04-21, 22:05

by

by feipoa

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

The issue with RSC-G2F-A66-X1 is that it will cover the other PCIe slot on the motherboard. Here's the board's layout: https://www.asrock.com/mb/ULI/939Dual-SATA2/ Using RSC-G2F-A66-X1 will trade the AGP, PCIe x1, and PCIex16 slots for two PCIe x8 slots.

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Re: PCIe x16 splitter to create two x8 ports?

Posted on 2021-04-21, 04:49

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by feipoa

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

For active riser cards from supermicro, these would be the only options that fit: Left-hand side RSC-R2UG-A2E16-A RSC-G2F-A66-X1 Right-hand side RSC-G2FR-A66 Here's an item similar to what I was originally looking for, but says BIOS needs support for bifurcation support: https://www.ebay.com/itm/ …

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Re: PCIe x16 splitter to create two x8 ports?

Posted on 2021-04-21, 02:39

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by feipoa

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Some update: I decided to install Ubuntu 18.04 and there is no issue with Unity in 64-bit. So seems that the Unity add-on for 18.04 doesn't do 32-bit, which is sort of understandable as 18.04 is the end of the road for 32-bit. On the Opteron 185 now, I'm using the Adaptec 6805T PCIe x8 RAID …

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Re: 3 (+3 more) retro battle stations

Posted on 2021-04-19, 23:08

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by feipoa

in Marvin \ System Specs

in Marvin \ System Specs

Found another interesting thread on vogons related to the the same 2x33MHz CPU model: https://www.vogons.org/viewtopic.php?f=25&t=52795 That's one of the 3 I was referring to, but the user kinda butchered it with those bodge wires shown here: https://www.vogons.org/viewtopic.php?f=46&t=52794 I am …

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Re: 3 (+3 more) retro battle stations

Posted on 2021-04-19, 21:04

by

by feipoa

in Marvin \ System Specs

in Marvin \ System Specs

Seems they are rarer than a Cyrix 5x86-133/4x. Aren't there only 3 users on Vogons and another 3 on CPU-World who have these? An ideal situation for me would be to put mine in a protective box for collection and run the SXL2-66 PGA168 variant on a PGA132 interposer. Have you seen the QFP SXL2-66 3.6 …

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Re: Biostar MB-8433UUD-A

Posted on 2021-04-19, 20:58

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by feipoa

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

If you continue to have issues with cross-linked files, you may want to go with a PCI Adaptec SCSI or Promise IDE card. Best overall is an Adaptec 2940U2W or 2940UW. They should allow for CD-ROM boot option and have working DOS drivers. The Promise Ultra100 is a nice and simple to use card, but they …

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Re: 3 (+3 more) retro battle stations

Posted on 2021-04-19, 04:21

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by feipoa

in Marvin \ System Specs

in Marvin \ System Specs

These tests were run many years back and I do not recall the specifics. I was attempting all perturbations of chipset, ISA freq, clkmul, 50 Mhz FSB, different FPUs, running Intel FPUs async, different oscillators, wait states, video cards, etc. There were too many combinations with thousands of …

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Re: 3 (+3 more) retro battle stations

Posted on 2021-04-18, 23:48

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by feipoa

in Marvin \ System Specs

in Marvin \ System Specs

For comparison, in checking my notes for MB's with hybrid UMC 481/482 with the same graphics card, same SRAM/DRAM quantities, etc. SXL2-50, ISA=8.3 MHz, DOOM = 5320 = 14.04 fps SXL2-50, ISA=12.5 MHz, DOOM = 5151 = 14.50 fps SXL2-55, ISA=9.2 MHz, DOOM = 4814 = 15.52 fps DRx2-66, ISA=11.1 MHz, DOOM = …

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Re: Biostar MB-8433UUD-A

Posted on 2021-04-17, 21:56

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by feipoa

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Please check my manual. This issue was covered. If you are using a CF card, set the IDE Primary Master PIO to PIO-4 instead of AUTO. I have experienced problems when booting to a CF card if AUTO is set. IDE Primary Master PIO - Auto [CF cards do not boot properly when set to Auto. Set to PIO-4 when …

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Re: 3 (+3 more) retro battle stations

Posted on 2021-04-17, 21:24

by

by feipoa

in Marvin \ System Specs

in Marvin \ System Specs

AMI Mark V Baby Screamer 32 MB 60 ns FPM 256KB L2 cache TI 486SXL2-66 CPU running at 66 MHz ULSI DX2-66 FPU running at 66 MHz Cirrus Logic GD-5434 (actually a Photon Torpedo card running with the Diamond BIOS) Adaptec 1542CP SCSI host controller card SCSI2SD v6 with Sandisk Extreme Pro, V30, UHS-I, …

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