diff --git a/artiq/firmware/libboard_artiq/ad9154.rs b/artiq/firmware/libboard_artiq/ad9154.rs
index e9b7db5db..5b876b371 100644
--- a/artiq/firmware/libboard_artiq/ad9154.rs
+++ b/artiq/firmware/libboard_artiq/ad9154.rs
@@ -184,7 +184,7 @@ fn dac_setup(dacno: u8, linerate: u64) -> Result<(), &'static str> {
 
     write(ad9154_reg::SPI_PAGEINDX, 0x3); // A and B dual
 
-    write(ad9154_reg::INTERP_MODE, 0); // 1x
+    write(ad9154_reg::INTERP_MODE, 0x01); // 2x
     write(ad9154_reg::MIX_MODE, 0);
     write(ad9154_reg::DATA_FORMAT, 0*ad9154_reg::BINARY_FORMAT); // s16
     write(ad9154_reg::DATAPATH_CTRL,
diff --git a/artiq/firmware/libboard_artiq/hmc830_7043.rs b/artiq/firmware/libboard_artiq/hmc830_7043.rs
index 2b381e60d..8156c5d36 100644
--- a/artiq/firmware/libboard_artiq/hmc830_7043.rs
+++ b/artiq/firmware/libboard_artiq/hmc830_7043.rs
@@ -156,7 +156,7 @@ pub mod hmc7043 {
     use board_misoc::{csr, clock};
 
     // All frequencies assume 1.2GHz HMC830 output
-    const DAC_CLK_DIV: u16 = 2;               // 600MHz
+    const DAC_CLK_DIV: u16 = 1;               // 1200MHz
     const FPGA_CLK_DIV: u16 = 8;              // 150MHz
     const SYSREF_DIV: u16 = 128;              // 9.375MHz
     const HMC_SYSREF_DIV: u16 = SYSREF_DIV*8; // 1.171875MHz (must be <= 4MHz)