<?xml version="1.0" encoding="UTF-8"?><rss xmlns:dc="http://purl.org/dc/elements/1.1/" xmlns:content="http://purl.org/rss/1.0/modules/content/" xmlns:atom="http://www.w3.org/2005/Atom" version="2.0"><channel><title><![CDATA[雙 RX 7900 XTX + Ubuntu 24.04 + ROCm 6.3 實戰報告]]></title><description><![CDATA[<p dir="auto"><img src="https://upload.lcz.me/uploads/8e0f5aab-a35e-40b3-8855-917343235709.jpg" alt="photo_2026-05-18_11-39-50.jpg" class=" img-fluid img-markdown" /> <img src="https://upload.lcz.me/uploads/45f52c9b-f463-479c-a07e-5538de48b7b7.jpg" alt="photo_2026-05-18_11-39-44.jpg" class=" img-fluid img-markdown" /> <img src="https://upload.lcz.me/uploads/a66a0c02-0939-4cd7-ae84-8b3ec02a1a4c.jpg" alt="photo_2026-05-18_11-39-30.jpg" class=" img-fluid img-markdown" /></p>
<p dir="auto">硬件：</p>
<ul>
<li>主板：HUANANZHI X99-CD3 GAMING（X99）</li>
<li>CPU：Xeon E5-2666 v3（10C/20T）</li>
<li>RAM：128GB DDR3 ECC @ 1600</li>
<li>GPU：2× RX 7900 XTX（PULSE，各 24GB）</li>
<li>儲存：NVMe 1.9TB（Win + Ubuntu + Shared）</li>
<li>OS：Ubuntu 24.04.4 / kernel 6.17.0</li>
</ul>
<p dir="auto">軟件：</p>
<ul>
<li>ROCm 6.3 / Python 3.12.3</li>
<li>llama.cpp b9198（自編譯 ROCm）</li>
<li>ComfyUI + ComfyUI-Manager</li>
<li>Shell scripts 管理全部操作（~/bin/）</li>
</ul>
<p dir="auto">LLM Benchmark（Qwen3.6-27B Q4_K_M）：</p>
<p dir="auto">單卡</p>
<p dir="auto">• 配置: 單卡</p>
<p dir="auto">• Context: 8K</p>
<p dir="auto">• Token Gen: 27.2 t/s</p>
<p dir="auto">單卡</p>
<p dir="auto">• 配置: 單卡</p>
<p dir="auto">• Context: 128K</p>
<p dir="auto">• Token Gen: 27.0 t/s</p>
<p dir="auto">雙卡 tensor-split</p>
<p dir="auto">• 配置: 雙卡 tensor-split</p>
<p dir="auto">• Context: 8K</p>
<p dir="auto">• Token Gen: 19.8 t/s</p>
<p dir="auto">雙卡 tensor-split</p>
<p dir="auto">• 配置: 雙卡 tensor-split</p>
<p dir="auto">• Context: 128K</p>
<p dir="auto">• Token Gen: 21.4 t/s</p>
<p dir="auto">→ 單卡打贏雙卡 tensor-split！27B Q4_K_M fit 入 24GB VRAM 單卡已經最快。雙卡只係 &gt;64K context 先用得著。</p>
<p dir="auto">投機解碼：<br />
Qwen3.6 用 M-RoPE，同 llama.cpp 投機解碼唔相容（全部 spec type 失敗，accept rate &lt; 13%）。Skip，27 t/s 已經夠快。</p>
<p dir="auto">ComfyUI 雙 Instance：<br />
兩張卡各一個獨立 ComfyUI（port 8188/8189），systemd 管理自動開機。</p>
<p dir="auto">Flux.1 dev：78.9s（雙 instance）vs 73.4s（tensor-split）<br />
LTX Video：13.5s（雙 instance）vs 22.9s（tensor-split）</p>
<p dir="auto">→ 雙 instance 整體完勝，尤其 LTX 快接近一倍，仲可以同時跑兩個 workflow。</p>
<p dir="auto">ROCm 6.3 tips：</p>
<ul>
<li>記得 delete blacklist-amdgpu.conf</li>
<li>唔使 HSA_OVERRIDE_GFX_VERSION（gfx1100 原生支援）</li>
<li>tensor-split 用 --tensor-split 24,24（absolute GiB）</li>
<li>ROCm 6.3 對 RX 7900 XTX 支援完善</li>
</ul>
]]></description><link>https://lcz.me/topic/189/雙-rx-7900-xtx-ubuntu-24.04-rocm-6.3-實戰報告</link><generator>RSS for Node</generator><lastBuildDate>Wed, 20 May 2026 07:04:39 GMT</lastBuildDate><atom:link href="https://lcz.me/topic/189.rss" rel="self" type="application/rss+xml"/><pubDate>Sun, 17 May 2026 19:43:13 GMT</pubDate><ttl>60</ttl><item><title><![CDATA[Reply to 雙 RX 7900 XTX + Ubuntu 24.04 + ROCm 6.3 實戰報告 on Mon, 18 May 2026 14:59:06 GMT]]></title><description><![CDATA[<p dir="auto">讲实话，这个方案性价比极高，因为既可以大模型，又可以ComfyUI，生产力拉满了，关键是安静，蓝宝石的这个白金版我非常喜欢，做工绝对优秀，钱都花在了刀刃上。</p>
]]></description><link>https://lcz.me/post/2429</link><guid isPermaLink="true">https://lcz.me/post/2429</guid><dc:creator><![CDATA[terry]]></dc:creator><pubDate>Mon, 18 May 2026 14:59:06 GMT</pubDate></item><item><title><![CDATA[Reply to 雙 RX 7900 XTX + Ubuntu 24.04 + ROCm 6.3 實戰報告 on Mon, 18 May 2026 13:57:25 GMT]]></title><description><![CDATA[<p dir="auto"><img src="https://upload.lcz.me/uploads/a88771fc-1678-4937-ae7d-39d5da146060.jpeg" alt="107204af-6081-40fe-b9de-9f6a76b45d48-image.jpeg" class=" img-fluid img-markdown" />,生产力相当可以了</p>
]]></description><link>https://lcz.me/post/2408</link><guid isPermaLink="true">https://lcz.me/post/2408</guid><dc:creator><![CDATA[John Ato]]></dc:creator><pubDate>Mon, 18 May 2026 13:57:25 GMT</pubDate></item><item><title><![CDATA[Reply to 雙 RX 7900 XTX + Ubuntu 24.04 + ROCm 6.3 實戰報告 on Mon, 18 May 2026 13:56:31 GMT]]></title><description><![CDATA[<p dir="auto">mtp是必须要开的,然后用最新版本7.2.3rocm,自己编译最新版本llama.cpp</p>
]]></description><link>https://lcz.me/post/2407</link><guid isPermaLink="true">https://lcz.me/post/2407</guid><dc:creator><![CDATA[John Ato]]></dc:creator><pubDate>Mon, 18 May 2026 13:56:31 GMT</pubDate></item><item><title><![CDATA[Reply to 雙 RX 7900 XTX + Ubuntu 24.04 + ROCm 6.3 實戰報告 on Mon, 18 May 2026 13:53:00 GMT]]></title><description><![CDATA[<p dir="auto"><a class="plugin-mentions-user plugin-mentions-a" href="/user/john-ato" aria-label="Profile: John-Ato">@<bdi>John-Ato</bdi></a> 是开mtp还是不开？</p>
]]></description><link>https://lcz.me/post/2405</link><guid isPermaLink="true">https://lcz.me/post/2405</guid><dc:creator><![CDATA[stakira]]></dc:creator><pubDate>Mon, 18 May 2026 13:53:00 GMT</pubDate></item><item><title><![CDATA[Reply to 雙 RX 7900 XTX + Ubuntu 24.04 + ROCm 6.3 實戰報告 on Mon, 18 May 2026 12:58:13 GMT]]></title><description><![CDATA[<p dir="auto">是的，双卡7900xtx也蛮好用的,能跑Q8,mtp后速度起飞,而且上下文可以打满256k,这样的生产力还是挺迷人的，目前的方案就已经足够做产品了。前提是要自己组硬件,有一定动手能力。我喜欢听蓝宝石显卡全力运作后风扇的"滋滋"声。</p>
]]></description><link>https://lcz.me/post/2391</link><guid isPermaLink="true">https://lcz.me/post/2391</guid><dc:creator><![CDATA[John Ato]]></dc:creator><pubDate>Mon, 18 May 2026 12:58:13 GMT</pubDate></item><item><title><![CDATA[Reply to 雙 RX 7900 XTX + Ubuntu 24.04 + ROCm 6.3 實戰報告 on Mon, 18 May 2026 12:41:09 GMT]]></title><description><![CDATA[<p dir="auto"><a class="plugin-mentions-user plugin-mentions-a" href="/user/john-ato" aria-label="Profile: John-Ato">@<bdi>John-Ato</bdi></a> 对，这数量级的decoding速度让人着迷。</p>
]]></description><link>https://lcz.me/post/2386</link><guid isPermaLink="true">https://lcz.me/post/2386</guid><dc:creator><![CDATA[David Zhang]]></dc:creator><pubDate>Mon, 18 May 2026 12:41:09 GMT</pubDate></item><item><title><![CDATA[Reply to 雙 RX 7900 XTX + Ubuntu 24.04 + ROCm 6.3 實戰報告 on Mon, 18 May 2026 12:11:40 GMT]]></title><description><![CDATA[<p dir="auto">Qwen3.6-27B-UD-Q4_K_XL.gguf ,ubuntu24.04 vulkan 单卡 7900 xtx能到 50多的</p>
]]></description><link>https://lcz.me/post/2382</link><guid isPermaLink="true">https://lcz.me/post/2382</guid><dc:creator><![CDATA[John Ato]]></dc:creator><pubDate>Mon, 18 May 2026 12:11:40 GMT</pubDate></item><item><title><![CDATA[Reply to 雙 RX 7900 XTX + Ubuntu 24.04 + ROCm 6.3 實戰報告 on Mon, 18 May 2026 12:06:45 GMT]]></title><description><![CDATA[<p dir="auto">rocm还是慢，我也把单卡7900 xtx移到了Linux机器上，rocm 只能跑到28，vulkan用自带驱动只有19，完全卸载驱动再安装官方驱动后vulkan稳定35。AMD驱动这个事还是挺讨厌的，实际上之前Windows上能跑到40上下。</p>
]]></description><link>https://lcz.me/post/2381</link><guid isPermaLink="true">https://lcz.me/post/2381</guid><dc:creator><![CDATA[stakira]]></dc:creator><pubDate>Mon, 18 May 2026 12:06:45 GMT</pubDate></item><item><title><![CDATA[Reply to 雙 RX 7900 XTX + Ubuntu 24.04 + ROCm 6.3 實戰報告 on Mon, 18 May 2026 11:42:00 GMT]]></title><description><![CDATA[<p dir="auto">单卡是vulkan更快(其实也有点不稳定,尤其prefill),双卡肯定是rocm更稳</p>
]]></description><link>https://lcz.me/post/2380</link><guid isPermaLink="true">https://lcz.me/post/2380</guid><dc:creator><![CDATA[John Ato]]></dc:creator><pubDate>Mon, 18 May 2026 11:42:00 GMT</pubDate></item><item><title><![CDATA[Reply to 雙 RX 7900 XTX + Ubuntu 24.04 + ROCm 6.3 實戰報告 on Mon, 18 May 2026 11:33:50 GMT]]></title><description><![CDATA[<p dir="auto">--split-mode tensor,速度有明显提升，前提是cpu有双直连 pcie4.0x8通道<br />
<img src="https://upload.lcz.me/uploads/d17039cc-ad2b-4f63-bb38-2dae437335be.jpeg" alt="52d84b32-ba2e-414d-9e63-31bbb4a7a7da-image.jpeg" class=" img-fluid img-markdown" />,<br />
<img src="https://upload.lcz.me/uploads/612bbc3b-f955-4de6-bfa8-01cf6a7e6ec0.jpeg" alt="681513cb-1617-4c4d-af14-689928ca770d-image.jpeg" class=" img-fluid img-markdown" /><br />
<img src="https://upload.lcz.me/uploads/2a319384-2c6a-4098-ab0d-9cebc000a822.jpeg" alt="46b9861b-df1f-4ec4-b3e2-7060a67c604c-image.jpeg" class=" img-fluid img-markdown" /></p>
]]></description><link>https://lcz.me/post/2379</link><guid isPermaLink="true">https://lcz.me/post/2379</guid><dc:creator><![CDATA[John Ato]]></dc:creator><pubDate>Mon, 18 May 2026 11:33:50 GMT</pubDate></item><item><title><![CDATA[Reply to 雙 RX 7900 XTX + Ubuntu 24.04 + ROCm 6.3 實戰報告 on Mon, 18 May 2026 11:10:41 GMT]]></title><description><![CDATA[<p dir="auto"><a class="plugin-mentions-user plugin-mentions-a" href="/user/fenky0304" aria-label="Profile: fenky0304">@<bdi>fenky0304</bdi></a> 純粹為了興趣</p>
]]></description><link>https://lcz.me/post/2378</link><guid isPermaLink="true">https://lcz.me/post/2378</guid><dc:creator><![CDATA[Chan Ivan]]></dc:creator><pubDate>Mon, 18 May 2026 11:10:41 GMT</pubDate></item><item><title><![CDATA[Reply to 雙 RX 7900 XTX + Ubuntu 24.04 + ROCm 6.3 實戰報告 on Mon, 18 May 2026 11:08:50 GMT]]></title><description><![CDATA[<p dir="auto"><a class="plugin-mentions-user plugin-mentions-a" href="/user/david-zhang" aria-label="Profile: David-Zhang">@<bdi>David-Zhang</bdi></a> 謝謝，這個我做吓研究</p>
]]></description><link>https://lcz.me/post/2377</link><guid isPermaLink="true">https://lcz.me/post/2377</guid><dc:creator><![CDATA[Chan Ivan]]></dc:creator><pubDate>Mon, 18 May 2026 11:08:50 GMT</pubDate></item><item><title><![CDATA[Reply to 雙 RX 7900 XTX + Ubuntu 24.04 + ROCm 6.3 實戰報告 on Mon, 18 May 2026 11:08:15 GMT]]></title><description><![CDATA[<blockquote>
<p dir="auto"><a class="plugin-mentions-user plugin-mentions-a" href="/user/terry" aria-label="Profile: terry">@<bdi>terry</bdi></a> <a href="/post/2273">说</a>:</p>
<p dir="auto">说实话哥们能把这张肥卡用两张放到一个机箱里我也挺震惊的，我的主板除非用延长线，否则做不到。</p>
</blockquote>
<p dir="auto">雖然是同一個機箱內，但我用了延長線把下面的卡放在底部，把下面卡的風扇對住底部的風口，墊高了一點</p>
]]></description><link>https://lcz.me/post/2376</link><guid isPermaLink="true">https://lcz.me/post/2376</guid><dc:creator><![CDATA[Chan Ivan]]></dc:creator><pubDate>Mon, 18 May 2026 11:08:15 GMT</pubDate></item><item><title><![CDATA[Reply to 雙 RX 7900 XTX + Ubuntu 24.04 + ROCm 6.3 實戰報告 on Mon, 18 May 2026 11:05:11 GMT]]></title><description><![CDATA[<p dir="auto"><a class="plugin-mentions-user plugin-mentions-a" href="/user/terry" aria-label="Profile: terry">@<bdi>terry</bdi></a> 遲些會補充的 <img src="https://lcz.me/assets/plugins/nodebb-plugin-emoji/emoji/android/1f468.png?v=d348ca29232" class="not-responsive emoji emoji-android emoji--man" style="height:23px;width:auto;vertical-align:middle" title=":man:" alt="👨" /></p>
]]></description><link>https://lcz.me/post/2375</link><guid isPermaLink="true">https://lcz.me/post/2375</guid><dc:creator><![CDATA[Chan Ivan]]></dc:creator><pubDate>Mon, 18 May 2026 11:05:11 GMT</pubDate></item><item><title><![CDATA[Reply to 雙 RX 7900 XTX + Ubuntu 24.04 + ROCm 6.3 實戰報告 on Mon, 18 May 2026 08:58:00 GMT]]></title><description><![CDATA[<p dir="auto">感謝您的無法分享!!! ^_^</p>
]]></description><link>https://lcz.me/post/2344</link><guid isPermaLink="true">https://lcz.me/post/2344</guid><dc:creator><![CDATA[fenky0304]]></dc:creator><pubDate>Mon, 18 May 2026 08:58:00 GMT</pubDate></item><item><title><![CDATA[Reply to 雙 RX 7900 XTX + Ubuntu 24.04 + ROCm 6.3 實戰報告 on Mon, 18 May 2026 06:07:27 GMT]]></title><description><![CDATA[<p dir="auto">说实话哥们能把这张肥卡用两张放到一个机箱里我也挺震惊的，我的主板除非用延长线，否则做不到。</p>
]]></description><link>https://lcz.me/post/2273</link><guid isPermaLink="true">https://lcz.me/post/2273</guid><dc:creator><![CDATA[terry]]></dc:creator><pubDate>Mon, 18 May 2026 06:07:27 GMT</pubDate></item><item><title><![CDATA[Reply to 雙 RX 7900 XTX + Ubuntu 24.04 + ROCm 6.3 實戰報告 on Mon, 18 May 2026 02:56:42 GMT]]></title><description><![CDATA[<p dir="auto"><a class="plugin-mentions-user plugin-mentions-a" href="/user/chan-ivan" aria-label="Profile: Chan-Ivan">@<bdi>Chan-Ivan</bdi></a> 估计是两张显卡的 pcie 带宽瓶颈，如果3.0 x16, 向量并行，我猜应该不止这个速度，reddit上也有人跑过双xtx。</p>
]]></description><link>https://lcz.me/post/2239</link><guid isPermaLink="true">https://lcz.me/post/2239</guid><dc:creator><![CDATA[David Zhang]]></dc:creator><pubDate>Mon, 18 May 2026 02:56:42 GMT</pubDate></item><item><title><![CDATA[Reply to 雙 RX 7900 XTX + Ubuntu 24.04 + ROCm 6.3 實戰報告 on Sun, 17 May 2026 20:03:26 GMT]]></title><description><![CDATA[<p dir="auto">非常不错的帖子，再多补充点，空出位置来给你置顶！</p>
]]></description><link>https://lcz.me/post/2211</link><guid isPermaLink="true">https://lcz.me/post/2211</guid><dc:creator><![CDATA[terry]]></dc:creator><pubDate>Sun, 17 May 2026 20:03:26 GMT</pubDate></item></channel></rss>